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Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel

A laser welding and laser technology, applied in the direction of laser welding equipment, improvement of process efficiency, welding equipment, etc., can solve problems such as no effect

Inactive Publication Date: 2014-10-15
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

This method belongs to stress-relief annealing, which can improve the mechanical properties of welds and reduce the rate of broken bands for common steel types, but has no effect on laser welds of phosphorus-containing IF steels.

Method used

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  • Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel
  • Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel
  • Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel

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Experimental program
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Effect test

Embodiment 1

[0021] In this embodiment, the thickness of the chilled phosphorus-containing IF steel plate is 0.8 mm, the power of the laser welder is 2000 W, and the welding speed is 3 m / min. The length of the high-frequency induction coil used for heat treatment in the weld area after welding is 100mm longer than the weld, the heat treatment time is 1 minute, and the heat treatment temperature is 1100°C.

[0022] Metallographic testing results show that the hardness of the weld is 195HV, and the hardness of the base metal is 155HV (see Figure 4 ), the microhardness of the weld is significantly higher than that of the base metal; tensile fracture occurs in the base metal (see image 3 ), the weld strength is higher than that of the base metal. The number of repeated bending fractures of the weld was 19 times, and the number of repeated bending fractures of the base metal was 18 times.

Embodiment 2

[0024] In this embodiment, the thickness of the chilled phosphorus-containing IF steel plate is 1.4 mm, the power of the laser welder is 3000 W, and the welding speed is 3 m / min. The length of the high-frequency induction coil used for heat treatment in the weld area after welding is 50 mm longer than that of the weld, the heat treatment time is 2 minutes, and the heat treatment temperature is 1000 °C.

[0025] The metallographic test results show that the hardness of the weld is 180HV, the hardness of the base metal is 140HV, the microhardness of the weld is significantly higher than that of the base metal, the tensile fracture occurs in the base metal, and the strength of the weld is higher than that of the base metal. The number of times when the weld was repeatedly bent and broken was 20 times, and the number of times when the base metal was repeatedly bent and broken was 17 times.

Embodiment 3

[0027] In this embodiment, the thickness of the chilled phosphorus-containing IF steel plate is 1.6mm, the power of the laser welder is 4000W, and the welding speed is 5m / min. Equal length, the heat treatment time is 3 minutes, and the heat treatment temperature is 800°C.

[0028] Metallographic testing results show that the hardness of the weld seam is 175HV, and the hardness of the base metal is 135HV. The microhardness of the weld seam is significantly higher than that of the base metal; the tensile fracture occurs in the base metal, and the strength of the weld seam is higher than that of the base metal. The number of times when the weld was repeatedly bent and broken was 20 times, and the number of times when the base metal was repeatedly bent and broken was 16 times.

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Abstract

The invention discloses a method for lowering the laser welding joint tapebreak rate of a chill state phosphate-containing IF (interstitial free) steel plate with the thickness of 0.8-1.8 mm. The method comprises the following steps of 1) laser welding: connecting the head and tail of the steel plate by laser welding, wherein the power of a laser welding apparatus for laser welding is 2000-5000 W, and the welding speed is 3-20 m / min; high frequency induction heating equipment is not arranged at a welding head of the laser welding apparatus; 2) thermal treatment after welding: a high frequency induction coil is arranged at an outlet of the laser welding apparatus, and the length of the high frequency induction coil is greater than a welding joint by 0-100 mm; after welding, performing thermal treatment on the welding joint and the scope of at least 100mm on each side of the length direction of the welding joint. According to the method, thermal treatment is performed after laser welding, the strength and hardness of the welding joint and base metal are reduced simultaneously, the decrease amplitude of the strength and hardness of the welding joint is greater that that of the base metal, the strength and hardness of the base metal at the welding joint area is lower than the welding joint, and thus the welding joint tapebreak rate is lowered greatly.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to a method for reducing the band breakage rate of laser welding seam of chilled phosphorus-containing IF steel. Background technique [0002] IF steel (that is, interstitial atom-free steel) is a new generation of deep-drawing steel plate that has emerged with the development of vacuum smelting technology since the 1970s and has been industrially produced. Phosphorus-containing IF steel mainly uses the solid solution strengthening effect of phosphorus to improve the steel strength. Due to its low yield strength and very high plastic strain ratio, this kind of steel plate has excellent ultra-deep drawing performance, and is widely used in the production of inner and outer panels and structural parts of the body, so it is widely used in automobiles, machinery, etc. Welcome to the industrial production sector. [0003] Phosphorus-containing IF steel is in a chilled...

Claims

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Application Information

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IPC IPC(8): B23K26/24C21D9/50C21D1/42
CPCB23K26/24C21D1/42C21D9/50Y02P10/25
Inventor 钟如涛高俊刘念郑江鹏牟文广方要治王靓
Owner 武汉钢铁有限公司
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