Laser welding method for cold-rolled steel plates for car and welding joint thereof

A cold-rolled steel plate and laser welding technology, which is applied to laser welding equipment, welding media, welding equipment, etc., can solve problems such as excessive alloying of welds, waste of resources, and increased production costs, and achieve a reduction in the temperature range where high temperatures exist, The effect of reducing the degree of alloying and reducing the production cost

Active Publication Date: 2018-11-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method passes through a large number of austenitizing elements, such as manganese and carbon, the filler wire still contains other austenitizing elements, so it is not clear which elements inhibit the formation of high-temperature delta ferrite, so it cannot be Avoid excessive alloying of welds, increase production costs, and cause unnecessary waste of resources

Method used

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  • Laser welding method for cold-rolled steel plates for car and welding joint thereof
  • Laser welding method for cold-rolled steel plates for car and welding joint thereof
  • Laser welding method for cold-rolled steel plates for car and welding joint thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A laser welding method for cold-rolled steel sheets for automobiles, comprising the steps of:

[0047] S1. Take two cold-rolled steel plates with a thickness of 1.5 mm. The base metal structure is lath martensite. At least one cold-rolled steel plate is a hot-formed steel plate with an Al-Si coating. Use acetone to remove the oil on the surface of the hot-formed steel plate , prepare the welding jig and wait for it to be used.

[0048] S2. Place the two cold-rolled steel plates that have been decontaminated in step S1 on the workbench in a spliced ​​manner and fix them with welding fixtures. There is a gap between the two cold-rolled steel plates, and the gap distance is 0.02mm.

[0049] S3. In step S2, manganese-copper alloy foil is filled in the gap between the two cold-rolled steel plates, wherein the selected manganese-copper alloy foil has a manganese element content of 5%, a copper element content of 95%, and a thickness of 0.02 mm;

[0050] S4. Use the IPG-6kW f...

Embodiment 2

[0054] A laser welding method for cold-rolled steel sheets for automobiles, comprising the steps of:

[0055] S1. Take two cold-rolled steel plates with a thickness of 1.5 mm. The base metal structure is lath martensite. At least one cold-rolled steel plate is a hot-formed steel plate with an Al-Si coating. Use acetone to remove the surface of the hot-formed steel plate. Oil stains, prepare the welding jig and wait for it to be used.

[0056] S2. Place the two cold-rolled steel plates that have been decontaminated in step S1 on the workbench in a spliced ​​manner and fix them with welding fixtures. There is a gap between the two cold-rolled steel plates, and the gap distance is 0.06mm.

[0057] S3, filling the gap between the two cold-rolled steel plates in step S2 with manganese-copper alloy wire, wherein the selected manganese-copper alloy wire has a manganese element content of 10%, a copper element content of 90%, and a thickness of 0.06 mm;

[0058] S4. Use the IPG-6kW f...

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Abstract

The invention provides a laser welding method for cold-rolled steel plates for a car. The method comprises the following specific steps that 1, two cold-rolled steel plates are taken, oil dirt on thesurfaces is removed, and a welding clamp is prepared for standby application; 2, the two cold-rolled steel plates subjected to dirt removal treatment in the step 1 are placed on a working table in a spliced manner and fixed through the welding clamp, and a gap exists between the two cold-rolled steel plates; 3, the gap between the two cold-rolled steel plates in the step 2 is filled with manganesecopper alloy welding filler; 4, a laser device is selected, and laser device machining parameters are set; and 5, the laser device in the step 4 is adopted for irradiating the spliced portion of thetwo cold-rolled steel plates, the spliced portion is fused, solidified and cooled to form a high-quality weld seam, and welding of the two cold-rolled steel plates is completed. According to the method, the problem existing in the prior art can be solved fully, meanwhile, the mechanical property of the welding joint can be improved, and the alloying degree and the production cost of the weld seamare reduced.

Description

technical field [0001] The invention relates to the technical field of welding of ultra-high-strength steel, in particular to a laser welding method of a cold-rolled steel plate for automobiles and a welding joint thereof. Background technique [0002] The rapid development of the automobile industry has played an important role in national economic and social development. However, affected by problems such as energy shortage and environmental pollution, reducing energy consumption is an important measure for the sustainable development of the automobile industry. In this context, the application of automotive lightweight and ultra-high-strength steel has become an important development direction. [0003] As a typical ultra-high-strength automotive steel, hot-formed steel plate has extremely high material strength and ductility. The tensile strength of general high-strength steel plates is about 400-450MPa, while the tensile strength of hot-formed steel plates has reached...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/60B23K26/70B23K35/30B23K37/04
CPCB23K26/24B23K26/60B23K26/703B23K35/0255B23K35/0261B23K35/302B23K37/0408
Inventor 王晓南陈夏明孙茜易格陈聪陈靖雨胡增荣张敏陈长军
Owner SUZHOU UNIV
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