CN105750752A - Method for preventing crack on partition plate structures of trunnions of steelmaking converters - Google Patents
Method for preventing crack on partition plate structures of trunnions of steelmaking converters Download PDFInfo
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- CN105750752A CN105750752A CN201610203828.6A CN201610203828A CN105750752A CN 105750752 A CN105750752 A CN 105750752A CN 201610203828 A CN201610203828 A CN 201610203828A CN 105750752 A CN105750752 A CN 105750752A
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Optics & Photonics (AREA)
- Quality & Reliability (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for preventing crack on partition plate structures of trunnions of steelmaking converters, and relates to a method for preventing crack on structures of steelmaking converters. The method includes carrying out buildup welding on Austenite weld materials for the trunnions and the partition plate structures; carrying out penetration flaw detection on buildup weld surfaces after buildup weld metal is cooled and the temperature of the buildup weld metal reaches the room temperature, and determining whether buildup weld layers have crack flaws or not; cutting thick cardboards to obtain post-buildup-weld inner hole sample plates and machining partition plates according to diameters of the partition plates; reserving gaps with the sizes of 2 millimeters between the partition plates and steps of holes of the trunnions when the partition plates are about to be mounted; carrying out circumferential seam welding on the partition plates; carrying out penetration flaw detection after the partition plates are subjected to circumferential seam welding. 2 millimeters are subtracted from the diameter of each sample plate to obtain the diameter of each partition plate. The method has the advantage that owing to modes of carrying out buttering on transition layers, reserving the expansion gaps, welding circumferential seams at two steps, carrying out back-step welding and the like, the problem of weld crack can be solved.
Description
Technical field
The present invention relates to a kind of method preventing steelmaking converter structural crack, particularly to a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle.
Background technology
In converter trunnion ring cooling system, it is one of backing ring device manufacturing technology key that gudgeon welds with dividing plate.Gudgeon material is forged steel, and the trade mark is SF440A, and wall thickness is 300 millimeters, and internal diameter is 600 millimeters；Separator material is rustless steel, and the trade mark is SUS304, and thickness is 30 millimeters.Welding method is SMAW, and welding rod model is E309.
Owing to this structure constraint (restraint) degree is big, weld crack happens occasionally.Manufacture in history in converter, once had weld crack to extend to the case within gudgeon, lesson bitterness.
In order to solve the problem of weld crack, domestic and international Welder author takes several steps, and has and significantly provides welding pre-heating temperature, has and adopts stay repair welding behind gap at 4, but all can not fundamentally solve weld crack problem.
Summary of the invention
It is an object of the invention to provide a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle, the method adopt pile transition zone in advance, leave expansion clearance, circumferential weld divides the modes such as two steps welding and backstep, solves weld crack problem.
It is an object of the invention to be achieved through the following technical solutions:
A kind of method preventing steelmaking converter gudgeon diaphragm structure crackle, described method includes procedure below:
1) for gudgeon and diaphragm structure, first gudgeon endoporus is treated that welding zone is polished, Sanding Area is carried out penetrant inspection, after flawless defect is determined in detection, start built-up welding austenite welding material；
2) after treating that deposited metal is cooled to room temperature, overlaying surface is carried out penetrant inspection detection, it is determined that overlay cladding flawless defect；
3) cutting system heap postwelding endoporus model with millboard, model diameter deducts 2 millimeters as dividing plate diameter, processes dividing plate by this diameter；
4), when installing dividing plate, reserved dividing plate has 2 millimeters of gaps with gudgeon hole step；
5) girth joint of dividing plate is welded；The welding sequence of diaphragm rings weld seam is first to weld circumference upper half, adopts vertical upward direction, backstep；Diaphragm rings weld seam needs four layers of weld seam to fill up, and during welding one to three layers, will adopt a point two-stage nitration backstep welding；Start not backstep from the 4th layer, be welded to concordant with groove always；During cap weld welding, respectively from 6 o'clock to 12 o'clock inverse position hour hands of clock with weld clockwise simultaneously, employing string(er) bead multi-pass welding；
6) postwelding carries out penetrant inspection detection.
A kind of described method preventing steelmaking converter gudgeon diaphragm structure crackle, described built-up welding divides two layers, thickness is 5 millimeters, overlay cladding width 40 millimeters, the welding rod model of built-up welding is E309-15, and core diameter is Φ 3.2 millimeters, welding current 75-90 ampere, arc voltage 24-25 volt, speed of welding 10 cm per minute；Welding rod little swinging technique is adopted during built-up welding；Heap weld preheating temperature is 50-80 DEG C, and between road, temperature is not more than 100 DEG C.
A kind of described method preventing steelmaking converter gudgeon diaphragm structure crackle, the welding rod model that the girth joint welding of described dividing plate adopts is E309-15, and core diameter is Φ 3.2 millimeters, welding current 75-90 ampere, arc voltage 24-25 volt, speed of welding 10 cm per minute；Little swinging technique is adopted during welding；Needing preheating temperature to be 50-80 DEG C before weldering, between road, temperature is not more than 100 DEG C.
A kind of described method preventing steelmaking converter gudgeon diaphragm structure crackle, the welding sequence of described diaphragm rings weld seam is first to weld circumference upper half, adopt vertical upward direction, backstep, by two welders welding simultaneously respectively, one welder welds from 3 o'clock to 12 o'clock positions of clock, first the 6th section of weld seam of weldering, the 5th section of weld seam of rear weldering；Another welder welding is position from 9 o'clock to 12 o'clock, first the 7th section of weld seam of weldering, the 8th section of weld seam of rear weldering.
A kind of described method preventing steelmaking converter gudgeon diaphragm structure crackle, the welding sequence of described diaphragm rings weld seam is, after upper half welding terminates, weld circumference lower half, welding process is similar to upper half, adopting vertical upward direction, backstep, by two welders welding simultaneously respectively, one welder welds from 6 o'clock to 3 o'clock positions of clock, first the 12nd section of weld seam of weldering, the 11st section of weld seam of rear weldering, another welder welds from 6 o'clock to 9 positions, first the 9th section of weld seam of weldering, the 10th section of weld seam of rear weldering.
Advantages of the present invention and effect be:
First the present invention adopts pre-heap transition zone technology on gudgeon, utilizes the welding stress produced during transition zone release welding.Certain interval is left so that have the space of expansion during dividing plate welding, it is possible to reduce gudgeon welding point constraint stress between dividing plate and gudgeon.Entirety circumferential weld is divided the modes such as two step four sections welding and backstep, solves welding gudgeon and dividing plate cracks problem.
Accompanying drawing explanation
Fig. 1 is gudgeon and diaphragm structure schematic diagram；
Fig. 2 is built-up welding transition zone schematic diagram；
Fig. 3 dividing plate groove and preset clearance schematic diagram；
Fig. 4 is girth joint welding sequence schematic diagram.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1:
1, gudgeon and diaphragm structure are as shown in Figure 1.First gudgeon endoporus is treated that welding zone is polished, Sanding Area is carried out penetrant inspection, after flawless defect is determined in detection, start built-up welding austenite welding material.Built-up welding divides two layers, and thickness is 5 millimeters, overlay cladding width 40 millimeters, as shown in Figure 2.The welding rod model of built-up welding is E309-15, and core diameter is Φ 3.2 millimeters, welding current 75 amperes, arc voltage 24 volts, speed of welding 10 cm per minute.Welding rod little swinging technique is adopted during built-up welding.Heap weld preheating temperature is 50 DEG C, and between road, temperature is not more than 100 DEG C.At gudgeon built-up welding austenite welding material, owing to constraint stress is little, and diffusible hydrogen is not had to affect, all, cold crack will not be produced in gudgeon heat affected area.
2, after treating that deposited metal is cooled to room temperature, overlaying surface is carried out penetrant inspection detection, it is determined that overlay cladding flawless defect.
3, cutting system heap postwelding endoporus model with millboard, model diameter deducts 2 millimeters as dividing plate diameter, processes dividing plate by this diameter.Dividing plate diameter than the purpose of little 2 millimeters of postwelding endoporus of heap is, after installing dividing plate, it is ensured that have suitable weld gap between dividing plate and gudgeon, if dividing plate is very close to each other with heap postwelding endoporus, welding stress can be caused to strengthen, form weld crack.
When 4, installing dividing plate, reserved dividing plate has 2 millimeters of gaps with gudgeon hole step, as it is shown on figure 3, slot milling when expanding for dividing plate, enables dividing plate freely to stretch, and reduces gudgeon welding heat affected zone shrinkage stress；
5, the girth joint welding of dividing plate, the welding rod model of employing is E309-15, and core diameter is Φ 3.2 millimeters, welding current 75 amperes, arc voltage 24 volts, speed of welding 10 cm per minute.Little swinging technique is adopted during welding.Needing preheating temperature before weldering is 50 DEG C, and between road, temperature is not more than 100 DEG C.
6, the welding sequence of diaphragm rings weld seam is first weldering circumference upper half, the vertical upward direction of employing, backstep, the weldings while of by two welders respectively, and a welder welds from 3 o'clock to 12 o'clock positions of clock, first welds the 6th section of weld seam, the 5th section of weld seam of rear weldering.Another welder welding is position from 9 o'clock to 12 o'clock, first the 7th section of weld seam of weldering, the 8th section of weld seam of rear weldering.
Upper half welding welds circumference lower half after terminating, and welding process is similar to upper half, adopting vertical upward direction, backstep, by two welders welding simultaneously respectively, one welder welds from 6 o'clock to 3 o'clock positions of clock, first the 12nd section of weld seam of weldering, the 11st section of weld seam of rear weldering.Another welder welds from 6 o'clock to 9 positions, first the 9th section of weld seam of weldering, the 10th section of weld seam of rear weldering.
7, diaphragm rings weld seam needs four layers of weld seam to fill up, and during welding one to three layers, will adopt a point two-stage nitration backstep welding.From the 4th layer start need not backstep, be welded to concordant with groove always.During cap weld welding, respectively from 6 o'clock to 12 o'clock inverse position hour hands of clock with weld clockwise simultaneously, employing string(er) bead multi-pass welding.
Postwelding carries out penetrant inspection detection, does not find the defects such as crackle.
Embodiment 2:
1, gudgeon and diaphragm structure are as shown in Figure 1.First gudgeon endoporus is treated that welding zone is polished, Sanding Area is carried out penetrant inspection, after flawless defect is determined in detection, start built-up welding austenite welding material.Built-up welding divides two layers, and thickness is 6 millimeters, overlay cladding width 45 millimeters, as shown in Figure 2.The welding rod model of built-up welding is E309-15, and core diameter is Φ 3.2 millimeters, welding current 90 amperes, arc voltage 25 volts, speed of welding 15 cm per minute.Welding rod little swinging technique is adopted during built-up welding.Heap weld preheating temperature is 80 DEG C, and between road, temperature is not more than 100 DEG C.At gudgeon built-up welding austenite welding material, owing to constraint stress is little, and diffusible hydrogen is not had to affect, all, cold crack will not be produced in gudgeon heat affected area.
2, after treating that deposited metal is cooled to room temperature, overlaying surface is carried out penetrant inspection detection, it is determined that overlay cladding flawless defect.
3, cutting system heap postwelding endoporus model with millboard, model diameter deducts 2 millimeters as dividing plate diameter, processes dividing plate by this diameter.Dividing plate diameter than the purpose of little 2 millimeters of postwelding endoporus of heap is, after installing dividing plate, it is ensured that have suitable weld gap between dividing plate and gudgeon, if dividing plate is very close to each other with heap postwelding endoporus, welding stress can be caused to strengthen, form weld crack.
When 4, installing dividing plate, reserved dividing plate has 2 millimeters of gaps with gudgeon hole step, as it is shown on figure 3, slot milling when expanding for dividing plate, enables dividing plate freely to stretch, and reduces gudgeon welding heat affected zone shrinkage stress.
5, the girth joint welding of dividing plate, the welding rod model of employing is E309-15, and core diameter is Φ 3.2 millimeters, welding current 90 amperes, arc voltage 25 volts, speed of welding 15 cm per minute.Little swinging technique is adopted during welding.Needing preheating temperature before weldering is 80 DEG C, and between road, temperature is not more than 100 DEG C.
6, the welding sequence of diaphragm rings weld seam is first weldering circumference upper half, the vertical upward direction of employing, backstep, the weldings while of by two welders respectively, and a welder welds from 3 o'clock to 12 o'clock positions of clock, first welds the 6th section of weld seam, the 5th section of weld seam of rear weldering.Another welder welding is position from 9 o'clock to 12 o'clock, first the 7th section of weld seam of weldering, the 8th section of weld seam of rear weldering.
Upper half welding welds circumference lower half after terminating, and welding process is similar to upper half, adopting vertical upward direction, backstep, by two welders welding simultaneously respectively, one welder welds from 6 o'clock to 3 o'clock positions of clock, first the 12nd section of weld seam of weldering, the 11st section of weld seam of rear weldering.Another welder welds from 6 o'clock to 9 positions, first the 9th section of weld seam of weldering, the 10th section of weld seam of rear weldering.
7, diaphragm rings weld seam needs four layers of weld seam to fill up, and during welding one to three layers, will adopt a point two-stage nitration backstep welding.From the 4th layer start need not backstep, be welded to concordant with groove always.During cap weld welding, respectively from 6 o'clock to 12 o'clock inverse position hour hands of clock with weld clockwise simultaneously, employing string(er) bead multi-pass welding.
Postwelding carries out penetrant inspection detection, does not find the defects such as crackle.
Claims (5)
1. the method preventing steelmaking converter gudgeon diaphragm structure crackle, it is characterised in that described method includes procedure below:
1) for gudgeon and diaphragm structure, first gudgeon endoporus is treated that welding zone is polished, Sanding Area is carried out penetrant inspection, after flawless defect is determined in detection, start built-up welding austenite welding material；
2) after treating that deposited metal is cooled to room temperature, overlaying surface is carried out penetrant inspection detection, it is determined that overlay cladding flawless defect；
3) cutting system heap postwelding endoporus model with millboard, model diameter deducts 2 millimeters as dividing plate diameter, processes dividing plate by this diameter；
4), when installing dividing plate, reserved dividing plate has 2 millimeters of gaps with gudgeon hole step；
5) girth joint of dividing plate is welded；The welding sequence of diaphragm rings weld seam is first to weld circumference upper half, adopts vertical upward direction, backstep；Diaphragm rings weld seam needs four layers of weld seam to fill up, and during welding one to three layers, will adopt a point two-stage nitration backstep welding；Start not backstep from the 4th layer, be welded to concordant with groove always；During cap weld welding, respectively from 6 o'clock to 12 o'clock inverse position hour hands of clock with weld clockwise simultaneously, employing string(er) bead multi-pass welding；
6) postwelding carries out penetrant inspection detection.
2. a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle according to claim 1, it is characterized in that, described built-up welding divides two layers, thickness is 5 millimeters, overlay cladding width 40 millimeters, and the welding rod model of built-up welding is E309-15, core diameter is Φ 3.2 millimeters, welding current 75-90 ampere, arc voltage 24-25 volt, speed of welding 10 cm per minute；Welding rod little swinging technique is adopted during built-up welding；Heap weld preheating temperature is 50-80 DEG C, and between road, temperature is not more than 100 DEG C.
3. a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle according to claim 1, it is characterized in that, the welding rod model that the girth joint welding of described dividing plate adopts is E309-15, core diameter is Φ 3.2 millimeters, welding current 75-90 ampere, arc voltage 24-25 volt, speed of welding 10 cm per minute；Little swinging technique is adopted during welding；Needing preheating temperature to be 50-80 DEG C before weldering, between road, temperature is not more than 100 DEG C.
4. a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle according to claim 1, it is characterized in that, the welding sequence of described diaphragm rings weld seam is first to weld circumference upper half, adopt vertical upward direction, backstep, by two welders welding simultaneously respectively, a welder welds from 3 o'clock to 12 o'clock positions of clock, first the 6th section of weld seam of weldering, the 5th section of weld seam of rear weldering；Another welder welding is position from 9 o'clock to 12 o'clock, first the 7th section of weld seam of weldering, the 8th section of weld seam of rear weldering.
5. a kind of method preventing steelmaking converter gudgeon diaphragm structure crackle according to claim 1, it is characterized in that, the welding sequence of described diaphragm rings weld seam is after upper half welding terminates, welding circumference lower half, welding process is similar to upper half, adopt vertical upward direction, backstep, by two welders welding simultaneously respectively, a welder welds from 6 o'clock to 3 o'clock positions of clock, first the 12nd section of weld seam of weldering, the 11st section of weld seam of rear weldering, another welder welds from 6 o'clock to 9 positions, first the 9th section of weld seam of weldering, the 10th section of weld seam of rear weldering.
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2016
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Effective date of registration: 20201217 Address after: People's Government of Jinshan Town, building 15, Qingshan langu community, Tangquan Road, Jinshan Town, Yuanbao District, Dandong City, Liaoning Province Patentee after: Dandong Jinshan Investment Construction Development Co.,Ltd. Address before: 110044 Liaoning Province, Shenyang City District wanghuanan Street No. 21 Patentee before: SHENYANG University |
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