CN105252117A - Manual tungsten-electrode argon arc welding process for nickel alloy process pipeline - Google Patents
Manual tungsten-electrode argon arc welding process for nickel alloy process pipeline Download PDFInfo
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- CN105252117A CN105252117A CN201510765399.7A CN201510765399A CN105252117A CN 105252117 A CN105252117 A CN 105252117A CN 201510765399 A CN201510765399 A CN 201510765399A CN 105252117 A CN105252117 A CN 105252117A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a manual tungsten-electrode argon arc welding process for a nickel alloy process pipeline. The manual tungsten-electrode argon arc welding process comprises the following steps: A, preparation before welding; B, fitting up; C, tack welding; D, examination before welding; E, manual welding, wherein a direct current straight polarity forehand welding is employed for multi-pass vertical-up welding, and the step E comprises the following substeps: E1) determining welding process parameters; E2) determining a welding position, an arc starting position and a welding direction of backing welding; E3) backing welding; and E4) forming a second layer of deposited metal and a rear layer of deposited metal on a backing welding deposited metal pass; F, examination of various objective factors of welding in the welding process; and G, examination after welding. When a grade N08825 nickel alloy process pipeline is welded by use of the welding process, such advantages as beautiful weld joint appearance, even weld lines, small heat input amount, dense structure, stable weld joint quality and low welding difficulty can be achieved.
Description
Technical field
The present invention relates to a kind of welding procedure, refer to especially a kind of special be the nickel alloy process pipe Manual argon-arc welding of N08825 for the trade mark.
Background technology
N08825 process pipe cleaning inside requires higher.Manual metal-arc welding single face welding and double face shaping technology, although can welding quality be ensured, the slag on root surface cannot thoroughly be removed, and can not meet the requirement of process pipe cleaning inside degree, the scope of application is restricted.And argon tungsten-arc welding is not owing to having slag, heat is concentrated, and fusion penetration is large, becomes the first-selected welding technique that N08825 process pipe prime coat, filling and capping layer weld.Tradition N08825 GTAW group is little to gap, even gapless, and welding requirements welder keeps arc length to stablize, and dead-beat, takes the air line.Actual welding often occurs that electric arc is uneven in the groove both sides time of staying, and arc length is unstable, cause outward appearance shaping bad, do not merge, the pore even defect such as incomplete root penetration.High to welder's skill set requirements generally, welding quality is unstable.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of nickel alloy process pipe Manual argon-arc welding, when utilizing this welding procedure to weld N08825 nickel alloy process pipe, appearance of weld is attractive in appearance, weldering line is even, heat input is little, dense structure, weldquality is stablized, and welding difficulty is low.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of nickel alloy process pipe Manual argon-arc welding, comprises the following steps:
A, welds prepares, comprise step by step following:
A1) selection tool: select the argon-arc torch of 75 °, diameter to be 40-50mm
2length is that 3-4m hand is the cerium tungsten electrode of wire, diameter 2.0mm or 2.4mm, the tip of cerium tungsten electrode is processed as the truncated cone of tapering 35 °-45 °, the axis of small circle of truncated cone is 0.8-1.0mm, and the extension elongation of the porcelain mouth of the relative argon-arc torch of cerium tungsten electrode is 6-8mm;
A2) acceptance of tubing and instrument: the trade mark and the specification that check tubing, guarantees that the tubing trade mark is N08825, diameter D> Φ 13mm, δ >1.5mm; Check whether the measurement instrument of DC argon arc welding torch and argon gas stream gauge has been demarcated and before the deadline, checked whether purity of argon is 99.99%, checks whether welding wire surface cleans, and whether the acceptance of tubing, welding wire physical and chemical parameter is qualified;
A3) tubing rule and carry out dimensional gaughing;
A4) to tubing cutting stock, the perpendicularity of otch end face and tubing axis is ensured;
A5) to the otch end face finished edge of two tubing that need weld, make the bevel angle sum of two tubing be 56 °-65 °, root face is 0.5-1mm;
A6) eliminating impurities in groove surfaces externally and internally 20mm is clean, expose metallic luster;
A7) check the argon-filling device of tubing inside runs whether meet technological requirement;
B, will need welding two tubing be grouping, comprise step by step following:
B1) confirmation group to identical with tubing material or the identical group of tooling fixture, need to use a little solid block time also to confirm that point used consolidates identical with tubing material or the identical group of block;
B2) confirmation group is less than 10% of wall thickness to pipeline section axiality, interior misalignment, and is less than or equal to 1mm;
B3) by two tubing horizontal group pair, the group at 6, tubing hour position place is 2.4mm to gap, and the group at ten two places is greater than 3.2mm to gap, and horizontally rotating weld bond group to gap is uniform 2.4mm, and horizontal position weld bond group is uniform 2.4mm to gap;
C, two tubing are carried out tack welding, comprise step by step following:
C1) determine that group is to mode: as caliber Φ 13mm < D < Φ 168.3mm, select spot welding group to fixing or put solid block group to fixing; As D >=Φ 168.3mm, select and a little consolidate block group to fixing;
C2) when selecting spot welding group pair, before the welding of groove root tack-weld, determine that back side argon filling purity meets welding requirements, groove root tack-weld will fuse in weld seam, the welding wire of tack welding and technique with formal weld identical;
C3) carry out tack welding to tubing: when selecting spot welding group pair, tack welding solder joint should avoid three, six, nine, 12 points in tubing hour position; When select a little solid block group pair time, tack-weld drops on mother metal outer surface, and the solid block of point should avoid three, six, nine, 12 points in tubing hour position, and the number of the solid block of point be even number and circumference uniform distribution on tubing;
C4) check tack welding quality: when selecting spot welding group pair, tack welding seam thickness 3-5mm, groove root tack-weld two ends, if tack-weld defectiveness must be polished remove tack welding again again, are polished into gentle slope type after tack welding by length 5-15mm; When selecting that a little solid block is fixed, tack welding seam thickness 4-8mm, length 25-55mm, tack-weld drops on pipe outer surface.；
Before D, weldering, objective factor checks to external world;
E, manual welding, adopt straight polarity direct current, leftward welding, multiple tracks vertical-up welding connects, and specifically comprises step by step following:
E1) determine that welding procedure meets following parameter: weld metal thickness G reatT.GreaT.GT 1.5mm; Welding current 60-140A; Weldingvoltage 10-14V; Speed of welding 5-12cm/min; Front protecting gas flow 10-25L/min; Reverse side shield gas flow rate 10-15L/min; When environment temperature is-20-0 DEG C, minimum preheat temperature is greater than 15 DEG C, and between the Gao road of per pass welding, temperature is less than or equal to 100 DEG C; Backing run and middle welding bead need polishing cleaning;
E2) the welding position of backing welding, starting the arc position and welding direction is determined: the circumferential section of the tubing fixed according to level divides, bottom position is defined as 6 positions, tip position is defined as 12 positions, and divide tubing cross section according to clock and watch scale, welding direction: 6 point → 12, point → 3 points; 6 point → 12, point → 9 points, and definition the traffic direction of welding is defined as before; Initial welding position is taken at rear side 10 ~ 20mm position of distance 6 positions;
E3) backing welding:
E31) when adopting the welding of spot welding group butt welded seam, soldering turret hand strides across arm rear right line and holds and move backward to initial welding position from the starting the arc of starting the arc position and dissolve into backing welding molten bath by tack welding seam with the traffic direction welding of 6 point → 12, point → 3 or 6 point → 12, point → 9 again; Tack welding seam is dissolved in backing welding molten bath with same welding manner with the traffic direction welding of 6 point → 12, point → 9 or 6 point → 12, point → 3 again; Finally by two sections of backing runs joint near 12, form whole piece backing welding deposited metal welding bead;
E32) when adopting the solid block of point, soldering turret hand strides across arm rear right line and holds the initial welding position moving backward to rear side 10 ~ 20mm position of distance 6 positions from the starting the arc of starting the arc position and move to 9 positions until the solid block of point running into front stops forming first paragraph backing welding deposited metal welding bead again; Between a position, 3 positions to 12 of tubing, near 12, second segment backing welding deposited metal welding bead is formed again with same welding manner; First paragraph backing welding deposited metal welding bead and second segment backing welding deposited metal welding bead symmetry; Again with same welding manner from starting the arc position backward mobile with first paragraph backing welding deposited metal welding bead after solder joint joint, then move until the solid block of point running into front stops formation the 3rd section of backing welding deposited metal welding bead to 3 positions; Between a position, 9 positions to 12 of tubing, near 12, the 4th section of backing welding deposited metal welding bead receiving acnode phase joint with second segment backing welding deposited metal welding bead is formed again, the 3rd section of backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead symmetry with same welding manner; So far first paragraph backing welding deposited metal welding bead and the 3rd section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 6 bands of position, second segment backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 12 bands of position, then are removed by the solid block of point at the two ends of the backing welding deposited metal welding bead of solid for the point at the two ends of the backing welding deposited metal welding bead of 6 bands of position block, 12 bands of position; If consolidate block a little, then with between the solid block of the point of same welding manner respectively between 6 point-9-points-12, between the solid block of the point between 6 .-3 .-12, form backing welding deposited metal welding bead; After symmetrical backing welding deposited metal welding bead is formed, solid for the point at the backing welding deposited metal welding bead two ends of symmetry block is removed, symmetric position welding, according to 6 point-9-point-12 dot sequency directions or 6 .-3 .-12 dot sequency directions, weldering from the backing run of welding before receives acnode, solder joint joint is played with the backing run of welding before front, finally by the multistage bottoming deposited metal welding bead joint at interval, form whole piece bottoming deposited metal welding bead;
E4) according to the welding direction identical with backing welding, molten bath is middle than weld seam long in the groove both sides time of staying, backing welding deposited metal welding bead forms second layer deposited metal, and the joint location of second layer deposited metal and the joint location of backing welding deposited metal welding bead stagger;
E5) deposited metals that the second layer is later comprises at least one deposited metals, per pass deposited metals is all according to the welding direction welding of backing welding, molten bath is middle than weld seam long to ensure groove face and interlayer penetration in the both sides time of staying, and the deposited metals joint of later layer and the joint of front one deck deposited metals stagger;
E6) in whole welding process, welding gun magnetic mouth lower support is on root groove face, as fulcrum, to hold with a firm grip electrode holder, wrist does uniform circular arcs motion, drive electrode holder within the scope of 70 ° ~ 85 ° of tungsten filament pressure cap axis, with magnetic mouth fulcrum for summit, tungsten electrode pressure cap and argon arc arc column do circular cone and swing and advance, along with the shaping of weld seam, Ci Zui bottom is transferred with the face of weld of red heat as supporting stable reach, the convex height of root is within the scope of 2mm, the root of groove is delivered in overhead weld position welding wire termination, level fixes the vertical upward slope of weld bond to welding wire termination, downhand position only to entering melt tank edge,
E7) welding manner during joint is: before joint location about 10mm groove in the starting the arc, then top, position, joint gentle slope is moved on to backward, electric arc in the groove both sides time of staying to ensure that both sides fuse, after molten bath is formed, control molten bath size gradually to silk, molten iron fills up melt run edge, both sides, molten bath, and then move forward and molten bath is moved forward, weld seam extends gradually;
In F, welding process, each objective factor of welding is checked;
G, postwelding inspection.
As the preferred scheme of one, the removal of the solid block of described point adopts electric angle grinder polishing to remove.
As the preferred scheme of one, in described step D, before weldering, objective factor carries out checking the inspection comprised groove defect, parameter to external world; The inspection of welding place humidity, temperature, wind speed; Prevent the inspection of managing interior draught measure; The inspection of tack-weld quality; Welding deformation and reversible deformation measure, prevent spatter thing from staiing the inspection of the measure on weldment surface; The inspection of welding place, work facility, jig.
As the preferred scheme of one, the inspection of step G postwelding comprises
G1) visual examination, 100% outward appearance self-inspection after weld seam completes;
G2) check scar when removing the solid block of point, whether polish flat, carry out PT inspection if desired, eliminate blemish;
G3) ray detection is carried out according to the designing requirement of process pipe.
After have employed technique scheme, effect of the present invention is: this welding procedure is reasonable, welding difficulty is low, magnetic mouth has a relatively-stationary fulcrum all the time, welder easily skilled for the exercise of the amplitude of the circular motion of wrist, frequency and fltting speed, can control the time of staying of electric arc on groove both sides uniformly, control arc length equably, uniform control speed of welding, ensures that heat input input is relatively uniform effectively.Because heat input is more even, the molten hole size of molten bath and front end is also even, coordinate wire feed and joint control technology effectively, guarantee that root is spent thoroughly with uniform convex height within the scope of 2mm, electric arc is at groove both sides time of staying long enough, to ensure that molten bore edges is filled up by molten iron, avoid occurring the anti-undercut defect of inwall, and on egative film, be shown as zigzag do not merge defect, the mode welding be symmetrically welded is utilized during backing welding, after the solid block of point that removal is corresponding, the group of technique tubing is to still more firm, make welding difficulty low, the intensity of backing welding is high, welding effect is good, when the later deposited metals of the second layer is formed, molten bath is middle than weld seam slightly long in the groove both sides time of staying, to ensure groove face penetration and to avoid ground floor weld metal subside or burn, also groove face and interlayer penetration can be ensured.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail.
A kind of nickel alloy process pipe Manual argon-arc welding, comprises the following steps:
A, welds prepares, comprise step by step following:
A1) selection tool: select the argon-arc torch of 75 °, diameter to be 40-50mm
2length is that 3-4m hand is the cerium tungsten electrode of wire, diameter 2.0mm or 2.4mm, the tip of cerium tungsten electrode is processed as the truncated cone of tapering 35 °-45 °, the axis of small circle of truncated cone is 0.8-1.0mm, and the extension elongation of the porcelain mouth of the relative argon-arc torch of cerium tungsten electrode is 6-8mm;
A2) acceptance of tubing and instrument: the trade mark and the specification that check tubing, guarantees that the tubing trade mark is N08825, diameter D> Φ 13mm, δ >1.5mm; Check whether the measurement instrument of DC argon arc welding torch and argon gas stream gauge has been demarcated and before the deadline, checked whether purity of argon is 99.99%, checks whether welding wire surface cleans, and welding wire surface cleaning, cleans with acetone if desired; Whether the acceptance of tubing, welding wire physical and chemical parameter is qualified;
A3) tubing rule and carry out dimensional gaughing;
A4) to tubing cutting stock, the perpendicularity of otch end face and tubing axis is ensured;
A5) to the otch end face finished edge of two tubing that need weld, make the bevel angle sum of two tubing be 56 °-65 °, root face is 0.5-1mm;
A6) eliminating impurities in groove surfaces externally and internally 20mm is clean, expose metallic luster;
A7) check the argon-filling device of tubing inside runs whether meet technological requirement;
B, will need welding two tubing be grouping, comprise step by step following:
B1) confirmation group to identical with tubing material or the identical group of tooling fixture, need to use a little solid block time also to confirm that point used consolidates identical with tubing material or the identical group of block;
B2) confirmation group is less than 10% of wall thickness to pipeline section axiality, interior misalignment, and is less than or equal to 1mm;
B3) by two tubing horizontal group pair, the group at 6, tubing hour position place is 2.4mm to gap, and the group at ten two places is greater than 3.2mm to gap, and horizontally rotating weld bond group to gap is uniform 2.4mm, and horizontal position weld bond group is uniform 2.4mm to gap; For convenience of description, divided in tubing cross section according to hour position, what faced by observing, cross section was in bottom is 6 positions, and tip position is ten two positions.
C, two tubing are carried out tack welding, comprise step by step following:
C1) determine that group is to mode: as caliber Φ 13mm < D < Φ 168.3mm, select spot welding group to fixing or put solid block group to fixing; As D >=Φ 168.3mm, select and a little consolidate block group to fixing;
C2) when selecting spot welding group pair, before the welding of groove root tack-weld, determine that back side argon filling purity meets welding requirements, groove root tack-weld will fuse in weld seam, the welding wire of tack welding and technique with formal weld identical;
C3) when selecting spot welding group pair, tack welding solder joint should avoid three, six, nine, 12 points in tubing hour position; When select a little solid block group pair time, tack-weld drops on mother metal outer surface, the solid block of point should avoid three, six, nine, 12 points in tubing hour position, reduces difficult locations joint and causes quality risk, and the number of the solid block of point be even number and circumference uniform distribution on tubing;
C4) check tack welding quality: when selecting spot welding group pair, tack welding seam thickness 3-5mm, groove root tack-weld two ends, if tack-weld defectiveness must be polished remove tack welding again again, are polished into gentle slope type after tack welding by length 5-15mm; When selecting that a little solid block is fixed, tack welding seam thickness 4-8mm, length 25-55mm, tack-weld drops on pipe outer surface, if tack-weld has the defects such as crackle must to polish removal;
Before D, weldering, objective factor checks to external world; It comprises the inspection to groove defect, parameter; The inspection of welding place humidity, temperature, wind speed; Prevent the inspection of managing interior draught measure; The inspection of tack-weld quality; Welding deformation and reversible deformation measure, prevent spatter thing from staiing the inspection of the measure on weldment surface; The inspection of welding place, work facility, jig.
E, manual welding, adopt straight polarity direct current, leftward welding, multiple tracks vertical-up welding connects, and specifically comprises step by step following:
E1) determine that welding procedure meets following parameter: weld metal thickness G reatT.GreaT.GT 1.5mm; Welding current 60-140A; Weldingvoltage 10-14V; Speed of welding 5-12cm/min; Front protecting gas flow 10-25L/min; Reverse side shield gas flow rate 10-15L/min; When environment temperature is-20-0 DEG C, minimum preheat temperature is greater than 15 DEG C, and between the Gao road of per pass welding, temperature is less than or equal to 100 DEG C; Backing run and middle welding bead need polishing cleaning;
E2) the welding position of backing welding, starting the arc position and welding direction is determined: the circumferential section of the tubing fixed according to level divides, bottom position is defined as 6 positions, tip position is defined as 12 positions, and divide tubing cross section according to clock and watch scale, welding direction: 6 point → 12, point → 3 points; 6 point → 12, point → 9 points, and definition the traffic direction of welding is defined as before; Initial welding position is taken at rear side 10 ~ 20mm position of distance 6 positions;
E3) backing welding:
E31) when adopting the welding of spot welding group butt welded seam, soldering turret hand strides across arm rear right line and holds and move backward to initial welding position from the starting the arc of starting the arc position and dissolve into backing welding molten bath by tack welding seam with the traffic direction welding of 6 point → 12, point → 3 or 6 point → 12, point → 9 again; Tack welding seam is dissolved in backing welding molten bath with same welding manner with the traffic direction welding of 6 point → 12, point → 9 or 6 point → 12, point → 3 again; Finally by two sections of backing runs joint near 12, form whole piece backing welding deposited metal welding bead; This bottoming deposited metals welding bead has multistage deposited metals to connect formation, and makes joint location avoid welding difficult locations;
E32) when adopting the solid block of point, soldering turret hand strides across arm rear right line and holds the initial welding position moving backward to rear side 10 ~ 20mm position of distance 6 positions from the starting the arc of starting the arc position and move to 9 positions until the solid block of point running into front stops forming first paragraph backing welding deposited metal welding bead again; Between a position, 3 positions to 12 of tubing, near 12, second segment backing welding deposited metal welding bead is formed again with same welding manner; First paragraph backing welding deposited metal welding bead and second segment backing welding deposited metal welding bead symmetry; Again with same welding manner from starting the arc position backward mobile with first paragraph backing welding deposited metal welding bead after solder joint joint, then move until the solid block of point running into front stops formation the 3rd section of backing welding deposited metal welding bead to 3 positions; Between a position, 9 positions to 12 of tubing, near 12, the 4th section of backing welding deposited metal welding bead receiving acnode phase joint with second segment backing welding deposited metal welding bead is formed again, the 3rd section of backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead symmetry with same welding manner; So far first paragraph backing welding deposited metal welding bead and the 3rd section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 6 bands of position, second segment backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 12 bands of position, then are removed by the solid block of point at the two ends of the backing welding deposited metal welding bead of solid for the point at the two ends of the backing welding deposited metal welding bead of 6 bands of position block, 12 bands of position; If consolidate block a little, then with between the solid block of the point of same welding manner respectively between 6 point-9-points-12, between the solid block of the point between 6 .-3 .-12, form backing welding deposited metal welding bead; After symmetrical backing welding deposited metal welding bead is formed, solid for the point at the backing welding deposited metal welding bead two ends of symmetry block is removed, symmetric position welding, according to 6 point-9-point-12 dot sequency directions or 6 .-3 .-12 dot sequency directions, weldering from the backing run of welding before receives acnode, solder joint joint is played with the backing run of welding before front, finally by the multistage bottoming deposited metal welding bead joint at interval, form whole piece bottoming deposited metal welding bead; For the solid block of four points, the solid block of point is distributed in 6 .-3 points respectively, between 6 .-9, between 9 .-12, between 3 .-12, define between 6 .-3 is the solid block of A point, between 6 .-9 is the solid block of B point, between 9 .-12 is the solid block of C point, and between 3 .-12 is the solid block of D point; Therefore during backing welding, initial welding position is 6 inclined 3 10-20mm, and then the now front starting the arc position starting the arc of initial welding position moves backward to initial welding position, and then moves formation first paragraph bottoming deposited metals to the solid block of B point; And then admittedly forming second segment bottoming deposited metals between block and 12 positions with same welding manner at D point, the welding direction of the formation of second segment bottoming deposited metals is also for will meet total welding direction, namely moved to 12 positions by the solid block of D point, receive arc position and be between 12 positions and the solid block of C point; Then admittedly form the 3rd section of bottoming deposited metals between block in 6 positions and A point in the same way, when the 3rd section of bottoming deposited metals is formed, need the solder joint joint with first paragraph bottoming deposited metals; Then consolidate formation the 4th section of bottoming deposited metals of block and 12 positions again at C point, the receipts acnode joint of second segment bottoming deposited metals and the 4th section of bottoming deposited metals, the 4th section of bottoming deposited metals and the 3rd section of bottoming deposited metals symmetry.Then solid for A, B, C, D point block is removed.If and when now the quantity of solid block is not four, such as, at the solid block of B point, the solid block of E point is also had between the solid block of C point, at the solid block of A point, the solid block of F point is also had between the solid block of D point, now same by A, B, C, the solid block of D point is removed, then solid between block and B point position at E point again according to the mode be symmetrically welded, the solid formation between block and D point position of F point piles bottoming deposited metals mutually, solid between block and C point position at E point again, F point is solid forms symmetrical bottoming deposited metals between block and A point position, then by E, the solid block of F point is all removed, and then by each section of bottoming deposited metals joint,
E4) according to the welding direction identical with backing welding, namely be also the major premise that demand fulfillment vertical-up welding connects, molten bath is middle than weld seam long in the groove both sides time of staying, to ensure that molten bore edges is filled up by molten iron, avoid occurring the anti-undercut defect of inwall, ensure groove face penetration and avoid ground floor weld metal subside or burn.Backing welding deposited metal welding bead forms second layer deposited metal, and the joint location of second layer deposited metal and the joint location of backing welding deposited metal welding bead stagger;
E5) deposited metals that the second layer is later comprises at least one deposited metals, per pass deposited metals is all according to the welding direction welding of backing welding, molten bath is middle than weld seam long to ensure groove face and interlayer penetration in the both sides time of staying, and the deposited metals joint of later layer and the joint of front one deck deposited metals stagger;
E6) in whole welding process, namely be no matter that the formation of the later deposited metals of backing welding or the second layer or the second layer is all adopted in a like fashion, welding gun magnetic mouth lower support is on root groove face, as fulcrum, to hold with a firm grip electrode holder, wrist does uniform circular arcs motion, drive electrode holder within the scope of 70 ° ~ 85 ° of tungsten filament pressure cap axis, with magnetic mouth fulcrum for summit, tungsten electrode pressure cap and argon arc arc column do circular cone and swing and advance, along with the shaping of weld seam, Ci Zui bottom is transferred with the face of weld of red heat as supporting stable reach, the convex height of root is within the scope of 2mm, the root of groove is delivered in overhead weld position welding wire termination, to avoid indent, form satisfied convex, level fixes the vertical upward slope of weld bond to welding wire termination, downhand position only to entering melt tank edge, and to avoid overlap, the speed of service of downhand welding attentional manipulation electrode holder, controls molten bath size, to avoid producing overlap, the wire feeding mode of welding wire has two kinds: 1., when using drop incontinuous wire fill method wire feed, after welding wire shifts out molten bath, gas shield district must not be shifted out in hot junction, welding wire termination, anti-oxidation, when 2, using continuous wire feed method, welding wire termination is kept not leave molten bath, and constantly uniformly toward wire feed in molten bath.Notice that wire feed is wanted steadily, prevent welding wire from contacting with high temperature tungsten electrode, cause that tungsten electrode is contaminated, scaling loss, also can destroy arc stability.Molten bath steadily should be sent in welding wire termination, avoid because of too fast too quickly and air is brought into molten bath produce pore.
E7) welding manner during joint is: before joint location about 10mm groove in the starting the arc, then top, position, joint gentle slope is moved on to backward, electric arc in the groove both sides time of staying to ensure that both sides fuse, after molten bath is formed, control molten bath size gradually to silk, molten iron fills up melt run edge, both sides, molten bath, and then move forward and molten bath is moved forward, weld seam extends gradually;
In F, welding process, each objective factor of welding is checked; Its content mainly comprises: whether inspection power type, polarity meet technological requirement; Check whether purity of argon and flow meet technological requirement; Whether back side argon filling meets technological requirement; Before backing run sealing, overhaul the quality that root is shaping, defective place polishes off in time, then again welds, until qualified; Check whether welding current, voltage, welding speed meet technological requirement; Check between road, whether temperature, interlayer temperature meet technological requirement; Multi-pass welding, joint all staggers; Per pass and interlayer are soldered 100% outward appearance self-inspection, remove face crack, pore and slag inclusion, remove lower one appearance of weld of impact and the groove of welding quality, removing joint bad position and harmful reinforcement high, initiatively accept quality testing department process check; Whether the solid block of nickel alloy point uses electric angle grinder to polish is removed;
G, postwelding inspection.The inspection of step G postwelding comprises
G1) visual examination, 100% outward appearance self-inspection after weld seam completes;
G2) check scar when removing the solid block of point, whether polish flat, carry out PT inspection if desired, eliminate blemish;
G3) ray detection is carried out according to the designing requirement of process pipe.
When utilizing this welding procedure to weld N08825 nickel alloy process pipe, appearance of weld is attractive in appearance, and weldering line is even, and heat input is little, dense structure, and weldquality is stablized, and welding difficulty is low.
The above embodiment is only the description to the preferred embodiment of the present invention; not as limiting the scope of the invention; design on the basis of spirit not departing from the present invention; the various distortion make technical solution of the present invention and transformation, all should fall in protection domain that claims of the present invention determine.
Claims (4)
1. a nickel alloy process pipe Manual argon-arc welding, comprises the following steps:
A, welds prepares, comprise step by step following:
A1) selection tool: select the argon-arc torch of 75 °, diameter to be 40-50mm
2length is that 3-4m hand is the cerium tungsten electrode of wire, diameter 2.0mm or 2.4mm, the tip of cerium tungsten electrode is processed as the truncated cone of tapering 35 °-45 °, the axis of small circle of truncated cone is 0.8-1.0mm, and the extension elongation of the porcelain mouth of the relative argon-arc torch of cerium tungsten electrode is 6-8mm;
A2) acceptance of tubing and instrument: the trade mark and the specification that check tubing, guarantees that the tubing trade mark is N08825, diameter D> Φ 13mm, thickness δ >1.5mm; Check whether the measurement instrument of DC argon arc welding torch and argon gas stream gauge has been demarcated and before the deadline, checked whether purity of argon is 99.99%, checks whether welding wire surface cleans, and whether the acceptance of tubing, welding wire physical and chemical parameter is qualified;
A3) tubing rule and carry out dimensional gaughing;
A4) to tubing cutting stock, the perpendicularity of otch end face and tubing axis is ensured;
A5) to the otch end face finished edge of two tubing that need weld, make the bevel angle sum of two tubing be 56 °-65 °, root face is 0.5-1mm;
A6) eliminating impurities within the scope of groove surfaces externally and internally 20mm is clean, expose metallic luster;
A7) check the argon-filling device of tubing inside runs whether meet technological requirement;
B, will need welding two tubing be grouping, comprise step by step following:
B1) confirmation group to identical with tubing material or the identical group of tooling fixture, need to use a little solid block time also to confirm that point used consolidates identical with tubing material or the identical group of block;
B2) confirmation group is to pipeline section axiality, and interior misalignment is less than 10% of wall thickness, and is less than or equal to 1mm;
B3) by two tubing horizontal group pair, the group at 6, tubing hour position place is 2.4mm to gap, and the group at ten two places is greater than 3.2mm to gap, and horizontally rotating weld bond group to gap is uniform 2.4mm, and horizontal position weld bond group is uniform 2.4mm to gap;
C, two tubing are carried out tack welding, comprise step by step following:
C1) determine that group is to mode: as caliber Φ 13mm < D < Φ 168.3mm, select spot welding group to fixing or put solid block group to fixing; As D >=Φ 168.3mm, select and a little consolidate block group to fixing;
C2) when selecting spot welding group pair, before the welding of groove root tack-weld, determine that back side argon filling purity meets welding requirements, groove root tack-weld will fuse in weld seam, the welding wire of tack welding and technique with formal weld identical;
C3) when selecting spot welding group pair, tack welding solder joint should avoid three, six, nine, 12 points in tubing hour position; When select a little solid block group pair time, tack-weld drops on mother metal outer surface, and the solid block of point should avoid three, six, nine, 12 points in tubing hour position, and the number of the solid block of point be even number and circumference uniform distribution on tubing;
C4) check tack welding quality: when selecting spot welding group pair, tack welding seam thickness 3-5mm, groove root tack-weld two ends, if tack-weld defectiveness must be polished remove tack welding again again, are polished into gentle slope type after tack welding by length 5-15mm; When selecting that a little solid block is fixed, tack welding seam thickness 4-8mm, length 25-55mm, tack-weld drops on pipe outer surface.；
Before D, weldering, objective factor checks to external world;
E, manual welding, adopt straight polarity direct current, leftward welding, multiple tracks vertical-up welding connects, and specifically comprises step by step following:
E1) determine that welding procedure meets following parameter: weld metal thickness G reatT.GreaT.GT 1.5mm; Welding current 60-140A; Weldingvoltage 10-14V; Speed of welding 5-12cm/min; Front protecting gas flow 10-25L/min; Reverse side shield gas flow rate 10-15L/min; When environment temperature is-20-0 DEG C, minimum preheat temperature is greater than 15 DEG C, and between the Gao road of per pass welding, temperature is less than or equal to 100 DEG C; The needs polishing cleaning of backing run and middle welding bead;
E2) the welding position of backing welding, starting the arc position and welding direction is determined: the circumferential section of the tubing fixed according to level divides, bottom position is defined as 6 positions, tip position is defined as 12 positions, and divide tubing cross section according to clock and watch scale, welding direction: 6 point → 12, point → 3 points; 6 point → 12, point → 9 points, and definition the traffic direction of welding is defined as before; Initial welding position is taken at rear side 10 ~ 20mm position of distance 6 positions;
E3) backing welding:
E31) when adopting the welding of spot welding group butt welded seam, soldering turret hand strides across arm rear right line and holds and move backward to initial welding position from the starting the arc of starting the arc position and dissolve into backing welding molten bath by tack welding seam with the traffic direction welding of 6 point → 12, point → 3 or 6 point → 12, point → 9 again; Tack welding seam is dissolved in backing welding molten bath with same welding manner with the traffic direction welding of 6 point → 12, point → 9 or 6 point → 12, point → 3 again; Finally by two sections of backing runs joint near 12, form whole piece backing welding deposited metal welding bead;
E32) when adopting the solid block group butt welded seam welding of point, soldering turret hand strides across arm rear right line and holds the initial welding position moving backward to rear side 10 ~ 20mm position of distance 6 positions from the starting the arc of starting the arc position and move to 9 positions until the solid block of point running into front stops forming first paragraph backing welding deposited metal welding bead again; Between a position, 3 positions to 12 of tubing, near 12, second segment backing welding deposited metal welding bead is formed again with same welding manner; First paragraph backing welding deposited metal welding bead and second segment backing welding deposited metal welding bead symmetry; Again with same welding manner from starting the arc position backward mobile with first paragraph backing welding deposited metal welding bead after solder joint joint, then move until the solid block of point running into front stops formation the 3rd section of backing welding deposited metal welding bead to 3 positions; Between a position, 9 positions to 12 of tubing, near 12, the 4th section of backing welding deposited metal welding bead receiving acnode phase joint with second segment backing welding deposited metal welding bead is formed again, the 3rd section of backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead symmetry with same welding manner; So far first paragraph backing welding deposited metal welding bead and the 3rd section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 6 bands of position, second segment backing welding deposited metal welding bead and the 4th section of backing welding deposited metal welding bead form the backing welding deposited metal welding bead of 12 bands of position, then are removed by the solid block of point at the two ends of the backing welding deposited metal welding bead of solid for the point at the two ends of the backing welding deposited metal welding bead of 6 bands of position block, 12 bands of position; If consolidate block a little, then with between the solid block of the point of same welding manner respectively between 6 point-9-points-12, between the solid block of the point between 6 .-3 .-12, form backing welding deposited metal welding bead; After symmetrical backing welding deposited metal welding bead is formed, solid for the point at the backing welding deposited metal welding bead two ends of symmetry block is removed, symmetric position welding, according to 6 point-9-point-12 dot sequency directions or 6 .-3 .-12 dot sequency directions, weldering from the backing run of welding before receives acnode, solder joint joint is played with the backing run of welding before front, finally by the multistage bottoming deposited metal welding bead joint at interval, form whole piece bottoming deposited metal welding bead;
E4) according to the welding direction identical with backing welding, molten bath is middle than weld seam long in the groove both sides time of staying, backing welding deposited metal welding bead forms second layer deposited metal, and the joint location of second layer deposited metal and the joint location of backing welding deposited metal welding bead stagger;
E5) deposited metals that the second layer is later comprises at least one deposited metals, per pass deposited metals is all according to the welding direction welding of backing welding, molten bath is middle than weld seam long to ensure groove face and interlayer penetration in the both sides time of staying, and the deposited metals joint of later layer and the joint of front one deck deposited metals stagger;
E6) in whole welding process, welding gun magnetic mouth lower support is on root groove face, as fulcrum, to hold with a firm grip electrode holder, wrist does uniform circular arcs motion, drive electrode holder within the scope of 70 ° ~ 85 ° of tungsten filament pressure cap axis, with magnetic mouth fulcrum for summit, tungsten electrode pressure cap and argon arc arc column do circular cone and swing and advance, along with the shaping of weld seam, Ci Zui bottom is transferred with the face of weld of red heat as supporting stable reach, the convex height of root is within the scope of 2mm, the root of groove is delivered in overhead weld position welding wire termination, level fixes the vertical upward slope of weld bond to welding wire termination, downhand position only to entering melt tank edge,
E7) welding manner during joint is: before joint location about 10mm groove in the starting the arc, then top, position, joint gentle slope is moved on to backward, electric arc is middle than weld seam long to ensure that both sides fuse in the groove both sides time of staying, after molten bath is formed, control molten bath size gradually to silk, molten iron fills up melt run edge, both sides, molten bath, and then move forward and molten bath is moved forward, weld seam extends gradually;
In F, welding process, each objective factor of welding is checked;
G, postwelding inspection.
2. a kind of nickel alloy process pipe Manual argon-arc welding as claimed in claim 1, is characterized in that: the removal of the solid block of described point adopts electric angle grinder polishing to remove.
3. a kind of nickel alloy process pipe Manual argon-arc welding as claimed in claim 2, is characterized in that: in described step D, before weldering, objective factor carries out checking the inspection comprised groove defect, parameter to external world; The inspection of welding place humidity, temperature, wind speed; Prevent the inspection of managing interior draught measure; The inspection of tack-weld quality; Welding deformation and reversible deformation measure, prevent spatter thing from staiing the inspection of the measure on weldment surface; The inspection of welding place, work facility, jig.
4. a kind of nickel alloy process pipe Manual argon-arc welding as claimed in claim 3, is characterized in that: the inspection of step G postwelding comprises
G1) visual examination, 100% outward appearance self-inspection after weld seam completes;
G2) check scar when removing the solid block of point, whether polish flat, carry out PT inspection if desired, eliminate blemish;
G3) ray detection is carried out according to the designing requirement of process pipe.
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| CN106180968A (en) * | 2016-08-23 | 2016-12-07 | 郑州荣奇热电能源有限公司 | A kind of thermal power plant horizontal pipe duct butt-welding method |
| CN106735758A (en) * | 2017-01-03 | 2017-05-31 | 苏州长风航空电子有限公司 | A kind of two-way argon arc welding method for preventing from welding deformation |
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| CN110695497A (en) * | 2019-08-30 | 2020-01-17 | 中国科学院合肥物质科学研究院 | Automatic TIG welding method for helium tube of large superconducting magnet coil |
| CN110695497B (en) * | 2019-08-30 | 2022-04-15 | 中国科学院合肥物质科学研究院 | Automatic TIG welding method for helium tube of large superconducting magnet coil |
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