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Laser welding method capable of eliminating hot rolling delta-TRIP steel weld cracks

A technology of laser welding and weld cracks, which is applied in the direction of laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problem of too fast air-cooling annealing rate, improve welding efficiency and welding pass rate, and improve welding quality. The effect of speed and guaranteed pass rate

Inactive Publication Date: 2019-10-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the air-cooling annealing rate is too fast due to the simultaneous heating of the laser welding and the annealing place in the prior art, and provides a method that can not only play the characteristics of the laser welding machine, but also make the laser weld joint No crack expansion or even fracture occurs. It is a laser welding method that can significantly improve welding efficiency and welding pass rate and can eliminate weld cracks in hot-rolled δ-TRIP steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A laser welding method capable of eliminating weld cracks in hot-rolled δ-TRIP steel, the steps of which are:

[0025] 1) Splicing the strip head of one steel coil to be welded and the tail of another steel coil after pickling, the seam is 0.01mm;

[0026] 2) Preheat the patchwork, the preheating temperature is 205°C;

[0027] 3) Perform conventional laser welding on the patchwork;

[0028] 4) The laser weld is heated in the heating section of the annealing furnace, and the heating temperature is 735°C;

[0029] 5) Enter the annealing section of the annealing furnace for annealing, and anneal the laser welded seam of the steel plate to 160°C at an annealing rate of 13°C / s;

[0030] 6) Carry out the post-processing of the steel plate normally.

[0031] After testing, no cracks were found at the weld seam of the steel plate welded in this embodiment, the cupping value of the weld seam increased from 1mm to 4mm, and the weld seam toughness was significantly improved.

Embodiment 2

[0033] A laser welding method capable of eliminating weld cracks in hot-rolled δ-TRIP steel, the steps of which are:

[0034] 1) Splicing the strip head of one steel coil to be welded and the tail of another steel coil after pickling, the seam is 0.017mm;

[0035] 2) Preheat the patchwork, the preheating temperature is 230°C;

[0036] 3) Perform conventional laser welding on the patchwork;

[0037] 4) The laser weld is heated in the heating section of the annealing furnace, and the heating temperature is 760°C;

[0038] 5) Enter the annealing section of the annealing furnace for annealing, and anneal the laser welded seam of the steel plate to 115°C at an annealing rate of 10°C / s;

[0039] 6) Carry out the post-processing of the steel plate normally.

[0040] After testing, no cracks were found at the weld seam of the steel plate welded in this embodiment, the cupping value of the weld seam increased from 1mm to 6mm, and the weld seam toughness was significantly improved. ...

Embodiment 3

[0042] A laser welding method capable of eliminating weld cracks in hot-rolled δ-TRIP steel, the steps of which are:

[0043] 1) Splicing the head of one steel coil to be welded after pickling and the tail of another steel coil, the seam is 0.02mm;

[0044] 2) Preheat the patchwork, the preheating temperature is 210°C;

[0045] 3) Perform conventional laser welding on the patchwork;

[0046] 4) The laser weld is heated in the heating section of the annealing furnace, and the heating temperature is 710°C;

[0047] 5) Enter the annealing section of the annealing furnace for annealing, and anneal the laser welded seam of the steel plate to 135°C at an annealing rate of 11°C / s;

[0048] 6) Carry out the post-processing of the steel plate normally.

[0049] After testing, no cracks were found at the weld seam of the steel plate welded in this embodiment, the cupping value of the weld seam increased from 1mm to 5.5mm, and the weld seam toughness was significantly improved.

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Abstract

The invention discloses a laser welding method capable of eliminating hot rolling delta-TRIP steel weld cracks. The laser welding method comprises the steps of splicing a tape head of a to-be-welded steel coil without pickling with a tape tail of the other steel coil; preheating the spliced seam; carrying out conventional laser welding on the spliced seam; heating the laser welding seam in a heating section of an annealing furnace; carrying out annealing in an annealing section of the annealing furnace; and performing normal post-process of the steel sheet. According to the laser welding method, a laser welding machine can not only perform the characteristics of laser welding, but also prevent crack spreading or even fracture on the laser welding joint, and the welding efficiency and the welding qualification rate can be obviously improved. During welding, the problems of low welding line energy of preheating and post-heating caused by high welding speed in the prior art are avoided, so that the welding speed is improved, and the welding time is shortened; and the qualified rate of the welding seam is ensured, and the cupping test value is increased from the original 1 mm to 4 mm at lowest.

Description

technical field [0001] The invention relates to a steel welding method, which belongs to a steel laser welding method, in particular to a laser welding method capable of eliminating weld cracks in hot-rolled δ-TRIP steel. Background technique [0002] The cold-rolling and acid-rolling unit uses a laser welding machine to weld the head and tail of the hot-rolled raw material strip to ensure the continuous operation of the production line. At present, laser welding of δ-TRIP steel before pickling is relatively difficult, that is, there are problems of high weld strength, high brittleness, and easy fracture. This is because δ-TRIP steel is a new type of automotive lightweight material, and its structure is dendritic δ-ferrite and bainite. High-power laser welding has the characteristics of large penetration depth, large depth-to-width ratio, fast welding speed, and low heat input. However, the cooling speed of laser welding is too fast, and the weld is easy to form a hardened ...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/60C21D1/30C21D9/50B23K103/04
CPCB23K26/24B23K26/60B23K2103/04C21D1/30C21D9/50
Inventor 高俊陈浮胡因洪孟显贺牟文广方要治
Owner 武汉钢铁有限公司
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