CN102848086A - Method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint - Google Patents
Method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint Download PDFInfo
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- CN102848086A CN102848086A CN201210312934XA CN201210312934A CN102848086A CN 102848086 A CN102848086 A CN 102848086A CN 201210312934X A CN201210312934X A CN 201210312934XA CN 201210312934 A CN201210312934 A CN 201210312934A CN 102848086 A CN102848086 A CN 102848086A
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Abstract
The invention discloses a method for improving strength and flexibility of a super strength steel laser-arc hybrid welded joint, belonging to the technical field of super strength steel welding. The welded joint in the conventional welding technology is low in strength and poor in flexibility. The method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint provided by the invention is characterized by comprising the following steps of: firstly, fusing the to-be-connected surfaces of two to-be-welded work pieces in advance by adopting a preprocessing laser to form a laser fusion preprocessing region, wherein the preprocessing laser power is 2-3kW, the scanning speed v1 is 1.5-2.5m/min, and the scanning overlap rate is 25-35%; and then, butting the fused to-be-connected surfaces of the two to-be-welded work pieces, and welding the to-be-connected surfaces by laser-arc hybrid welding. The method provided by the invention is used for butting welding of high-thickness super strength steel plates, and can improve the strength of the welded joint and improve the flexibility of the welded joint.
Description
Technical field
The present invention relates to a kind of method that improves unimach laser-arc hybrid welding in industry head strength and toughness, can improve welding quality, as improve unimach laser-arc hybrid welding in industry head intensity and toughness, the end face to be welded of at first treating weldment carries out the laser melting preliminary treatment, crystallite dimension in the laser melting pretreating zone is significantly reduced, crystal grain is fined, adopt afterwards laser-electric arc composite heat source to weld, the melt run of composite welding head is positioned at the laser melting pretreating zone, and the method belongs to the ultra-high tensile steel welding technical field.
Background technology
Adopting conventional MAG/MIG welding procedure to weld in the process of large thickness ultrahigh-strength steel plates, because the heat input is large, weld heat-affected zone is large, the heat affected area coarse grains, and therefore, the intensity of welding point and toughness descend.Adopting laser-arc hybrid welding in industry technique to weld in the process of large thickness ultrahigh-strength steel plates, welding heat affected zone crystal grain is seriously grown up; In addition, because the adding of laser makes part, two workpiece to be welded junctions stand high temperature, because heat is along weld penetration direction skewness, there are very large difference equally in the welding point and the mother metal that cause forming on institutional framework and mechanical behavior, directly have influence on anti-fracture behaviour, ability and the service reliability of welding point, these are also all directly related with intensity and the toughness of welding point.
Summary of the invention
In order to improve intensity and the toughness of unimach laser-arc hybrid welding in industry head, give full play to the advantages such as the Laser-Arc Hybrid Welding bonding speed is high, the welding energy input is little, welding deformation is little, we have invented a kind of method that improves unimach laser-arc hybrid welding in industry head strength and toughness.
The method of the present invention's raising unimach laser-arc hybrid welding in industry head strength and toughness is characterized in that, adopt first the plan joint face 3 of two workpiece 2 to be welded of preliminary treatment laser 1 consolidation preliminary treatment, form laser melting pretreating zone 4, as shown in Figure 1, preliminary treatment laser 1 power 2 ~ 3 kW, sweep speed v
1Be 1.5 ~ 2.5 m/min, the scanning overlapping rate is 25 ~ 35 %; Then will through plan joint face 3 docking of pretreated two workpiece 2 to be welded of consolidation, adopt again the Laser-Arc Hybrid Welding welding, as shown in Figure 2.
Its technique effect of the present invention's method is, obtain obvious refinement through the laser melting pretreating zone crystallite dimension that forms after the condensation preliminary treatment, the refinement of crystal grain means that crystal boundary increases, the conduction of welding heat is subject to larger obstruction, under identical external cooling and sweating heat initial conditions, welding heat affected zone obviously reduces, the welding heat loss also obviously reduces, the molten bath is elongated at high-temperature residence time, and the cooldown rate in molten bath is slack-off, and the thermograde in molten bath reduces, these variations are conducive to the homogenising of welding point microstructure, intensity improves, and toughness strengthens, anti-fracture behaviour, ability and service reliability improve.Adopt afterwards the Laser-Arc Hybrid Welding welding, because Laser-Arc Hybrid Welding electric arc formerly, laser is rear, the effect of laser stabilization electric arc is brought into play, so that Combined Welding process stabilization, speed of welding is improved, and the heat of input reduces, therefore, the crystal grain of laser melting pretreating zone can obviously not grown up in this welding process, keeps the ultra-high tensile steel welding existing intensity of workpiece welding point and toughness.
Description of drawings
Fig. 1 is that the present invention's method adopts the plan joint face of two workpiece to be welded of preliminary treatment laser melting preliminary treatment to form laser melting pretreating zone process schematic diagram.Fig. 2 is the pretreated unimach steel plate of the process condensation process schematic diagram that the present invention's method adopts two docking of Laser-Arc Hybrid Welding welding, and this figure is simultaneously as Figure of abstract.
The specific embodiment
The specific embodiment of the method for the present invention's raising unimach laser-arc hybrid welding in industry head strength and toughness is as follows.Adopt first the plan joint face 3 of two workpiece 2 to be welded of preliminary treatment laser 1 consolidation preliminary treatment, form laser melting pretreating zone 4, as shown in Figure 1.Described workpiece to be welded 2 is unimach, thickness 8 mm, tensile strength 600 MPa.Preliminary treatment laser 1 is from the Nd:YAG laser instrument, laser instrument peak power output 4kW, and output wavelength 1.06 μ m, the output continuous wave laser, adopting focal length is 175 focus lamp, defocusing amount-3 mm.Preliminary treatment laser 1 power 2 ~ 3 kW, sweep speed v
1Be 1.5 ~ 2.5 m/min, the scanning overlapping rate is 25 ~ 35 %, so-called scanning overlapping rate refer to be condensed pretreated workpiece to be welded 2 in the process of translation along the direction vertical with translation direction with sweep speed v
1Move back and forth, preliminary treatment laser 1 approaches and leaves overlay path that the reciprocating rotary break forms at a percentage in the scanning pattern back and forth.Then will be through plan joint face 3 docking of pretreated two workpiece 2 to be welded of consolidation, weld gap 0.5 mm adopts the Laser-Arc Hybrid Welding welding, as shown in Figure 2 again.Arc welding gun 5 is in front first welding.Electric arc adopts MIG electric arc or MAG electric arc, and from micro computer welding Waveform Control pulse MIG/MAG welding machine, supporting wire-feed motor is used diameter 1.2 mm stainless steel welding sticks 6.Arc current 180 ~ 240 A, arc voltage 25 ~ 28V, arc welding gun 5 is 60 ~ 70 ° with the angle theta on workpiece to be welded 2 surfaces, the arc welding protective gas is 20%CO
2+ 80%Ar, gas flow are 16L/min.Welding laser 7 welds subsequently.Welding laser 7 is from CO
2Laser instrument, laser instrument peak power output 8 kW, output wavelength 10.6 μ m, output continuous wave laser, employing focal length are 350 focus lamp, defocusing amount-1 mm.Welding laser 7 power 5 ~ 8 kW, bonding speed v
2Be 1 ~ 2 m/min, welding laser 7 is definite in 3 ~ 4 mm scopes with the spacing d of welding wire 6.Laser Welding coaxial shielding gas body is 30%He+70%Ar, and gas flow is 25L/min.
The below illustrates the present invention's method.Adopt first the plan joint face 3 of two workpiece 2 to be welded of preliminary treatment laser 1 consolidation preliminary treatment, form laser melting pretreating zone 4, as shown in Figure 1.Described workpiece to be welded 2 is unimach, thickness 8 mm, tensile strength 600 MPa.Preliminary treatment laser 1 is from the Nd:YAG laser instrument, laser instrument peak power output 4kW, and output wavelength 1.06 μ m, the output continuous wave laser, adopting focal length is 175 focus lamp, defocusing amount-3 mm.Preliminary treatment laser 1 power 2.5 kW, sweep speed v
1Be 2 m/min, the scanning overlapping rate is 30 %.Then will be through plan joint face 3 docking of pretreated two workpiece 2 to be welded of consolidation, weld gap 0.5 mm adopts the Laser-Arc Hybrid Welding welding, as shown in Figure 2 again.Arc welding gun 5 is in front first welding.Electric arc adopts MIG electric arc, and from micro computer welding Waveform Control pulse MIG/MAG welding machine, supporting wire-feed motor is used diameter 1.2 mm stainless steel welding sticks 6.Arc current 200 A, arc voltage 27V, arc welding gun 5 is 65 ° with the angle theta on workpiece to be welded 2 surfaces, the arc welding protective gas is 20%CO
2+ 80%Ar, gas flow are 16L/min.Welding laser 7 welds subsequently.Welding laser 7 is from CO
2Laser instrument, laser instrument peak power output 8 kW, output wavelength 10.6 μ m, output continuous wave laser, employing focal length are 350 focus lamp, defocusing amount-1 mm.Welding laser 7 power 5 kW, bonding speed v
2Be 1.5 m/min, welding laser 7 is 3 mm with the spacing d of welding wire 6.Laser Welding coaxial shielding gas body is 30%He+70%Ar, and gas flow is 25L/min.According to above-mentioned technique welding, welding melt run 8 is positioned at laser melting pretreating zone 4, resulting welding point surface and the equal flawless of section, welding point tensile strength is 1260 MPa, crooked gross energy reaches 46 N/m, and prior art directly adopts the tensile strength of electric arc-welding point that the laser Combined Welding obtains to only have 1080 MPa, and crooked gross energy also only has 35 N/m.
Claims (2)
1. method that improves unimach laser-arc hybrid welding in industry head strength and toughness, it is characterized in that, adopt first the plan joint face (3) of preliminary treatment laser (1) two workpiece to be welded of consolidation preliminary treatment (2), form laser melting pretreating zone (4), preliminary treatment laser (1) power 2 ~ 3 kW, sweep speed v
1Be 1.5 ~ 2.5 m/min, the scanning overlapping rate is 25 ~ 35 %; Then will through plan joint face (3) docking of pretreated two workpiece to be welded of consolidation (2), adopt again the Laser-Arc Hybrid Welding welding.
2. the method for raising unimach laser-arc hybrid welding in industry head strength and toughness according to claim 1 is characterized in that described workpiece to be welded (2) is unimach, thickness 8 mm, tensile strength 600 MPa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551761A (en) * | 2013-11-12 | 2014-02-05 | 中联重科股份有限公司 | Soldering flux, application and soldering method thereof |
| CN103831541A (en) * | 2013-12-05 | 2014-06-04 | 北京航星机器制造有限公司 | Laser and MIG electric arc compound welding method for high-strength steel butt joints |
| CN107363399A (en) * | 2017-08-16 | 2017-11-21 | 温州大学 | A kind of method of electric arc auxiliary laser weldering |
| CN107498182A (en) * | 2017-09-01 | 2017-12-22 | 上海交通大学 | A kind of compound molten bath concussion welding methods of laser scanning TIG |
| CN110405344A (en) * | 2018-04-27 | 2019-11-05 | 上海汇众汽车制造有限公司 | The gas hole defect suppressing method of the electric arc combined welding of high-strength steel laser-MIG |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551761A (en) * | 2013-11-12 | 2014-02-05 | 中联重科股份有限公司 | Soldering flux, application and soldering method thereof |
| CN103551761B (en) * | 2013-11-12 | 2015-12-30 | 中联重科股份有限公司 | Solder flux, its application and welding method |
| CN103831541A (en) * | 2013-12-05 | 2014-06-04 | 北京航星机器制造有限公司 | Laser and MIG electric arc compound welding method for high-strength steel butt joints |
| CN107363399A (en) * | 2017-08-16 | 2017-11-21 | 温州大学 | A kind of method of electric arc auxiliary laser weldering |
| CN107498182A (en) * | 2017-09-01 | 2017-12-22 | 上海交通大学 | A kind of compound molten bath concussion welding methods of laser scanning TIG |
| CN110405344A (en) * | 2018-04-27 | 2019-11-05 | 上海汇众汽车制造有限公司 | The gas hole defect suppressing method of the electric arc combined welding of high-strength steel laser-MIG |
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Application publication date: 20130102 |