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Laser butt welding process for strip steel

A technology of strip steel and butt welding, applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of lower product quality, poor weld firmness, weld accidents, etc., to improve welding strength, ensure normal operation, Reduce the effect of weld fracture

Inactive Publication Date: 2018-05-25
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For CR550 / DP980 hot-rolled high-strength steel, laser butt welding is usually used, but its alloy content and carbon equivalent are high, which makes the hardenability after welding strong, and the hardness of the weld heat-affected zone is high, so the weld seam The firmness is poor, and it is easy to break the belt in the high-tension production line, or a welding seam accident occurs during rolling, which reduces the quality of the product and is easy to cause damage to the equipment

Method used

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  • Laser butt welding process for strip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Product category: CR550 / DP980;

[0032] Specifications (thickness * width): 2.3mm*1250mm;

[0033] Equipment: The laser welding machine of the pickling mill is used for welding;

[0034] Welding process: the front coil strip tail and the back coil strip head entrance are cut, and then laser butt welding is performed;

[0035] Welding parameters: the rated power of the laser head is 12kW; the welding speed is 4.0m / min; the welding wire filling speed is 2.2m / min; the initial welding gap is -0.2mm; the welding seam heat treatment current is 110A;

[0036] Result analysis: After the above welding process, the weld seam is flat and smooth, no nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cup convex test. The strip steel is pickled and brought to the rolling mill. There was no accident of weld broken belt.

Embodiment 2

[0038] Product category: CR550 / DP980;

[0039] Specifications (thickness * width): 3.5mm*1224mm;

[0040] Welding process: the front coil strip tail and the back coil strip head entrance are cut, and then laser butt welding is performed;

[0041] Welding parameters: the rated power of the laser head is 12kW; the welding speed is 3.6m / min; the welding wire filling speed is 2.6m / min; the initial welding gap is -0.3mm; the welding seam heat treatment current is 130A;

[0042] Result analysis: After the above welding process, the weld seam is flat and smooth, no nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cup convex test. The strip steel is pickled and brought to the rolling mill. There was no accident of weld broken belt.

Embodiment 3

[0044] Product category: CR550 / DP980;

[0045] Specifications (thickness * width): 5.0mm*1224mm;

[0046] Equipment: The strip steel is welded by the laser welder of the pickling mill;

[0047] Welding process: the front coil strip tail and the back coil strip head entrance are cut, and then laser butt welding is performed;

[0048] Welding parameters: the rated power of the laser head is 12kW; the welding speed is 3.0m / min; the welding wire filling speed is 2.8m / min; the initial welding gap is -0.4mm; the welding seam heat treatment current is 150A;

[0049] Result analysis: After the above welding process, the weld seam is flat and smooth, no nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cup convex test. The strip steel is pickled and brought to the rolling mill. There was no accident of weld broken belt.

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Abstract

The invention discloses a laser butt welding process for strip steel. The process comprises the following steps: S1, positioning to-be-welded end portions of two pieces of strip steel in a shearing region, and shearing the end portions of the two pieces of strip steel by means of a cross-cut shear to ensure that the to-be-welded end portions are smooth; S2, controlling the gap between the to-be-welded end portions of the two pieces of strip steel and calibrating and positioning the two pieces of strip steel; and S3, carrying out butt welding on the to-be-welded end portions of the two pieces of strip steel by means of a laser head, and carrying out thermal treatment and rolling on a weld joint, wherein the welding power range of the laser head is 4.5-5.5kW. Through many time actual production examinations, the welding power range of the laser head is selected between 4.5kW and 5.5kW, so that the butt joint strength of the weld joint can be improved effectively, and the proportion of broken weld joint can be reduced effectively. Therefore, the laser butt welding process for strip steel disclosed by the invention can improve the welding strength of the weld joint of the strip steel,ensures normal operation of the equipment, and solves the problem in the field in the current stage.

Description

Technical field [0001] The invention relates to the field of hot-rolled high-strength steel welding, and more specifically, to a strip steel laser butt welding process. Background technique [0002] Strip welding is to weld the end and end of two strips together. It is an important process method for continuous production of steel enterprises, ensuring production efficiency and reducing production costs. It is widely used in combined pickling and rolling production lines, continuous annealing production lines and continuous galvanizing annealing production line. [0003] For CR550 / DP980 grade hot-rolled high-strength steel, laser butt welding is usually used, but its alloy content and carbon equivalent are high, which makes the hardenability after welding strong, and the hardness of the heat affected zone of the weld is relatively high. The firmness is poor, and it is easy to break the belt in the high-tension production line, or the welding seam accident occurs during rolling, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K26/26B23K103/04
CPCB23P15/00B23K26/26
Inventor 李波
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD