Welding method for 980MPa-level cold-rolled dual-phase steel

A welding method, 980mpa technology, applied in welding equipment, roller electrode welding, welding/welding/cutting articles, etc., can solve the problems of large welding current, poor weldability, difficulty in obtaining smooth and smooth weld quality, etc., and achieve reduction The effect of the cost of capital

Active Publication Date: 2016-06-01
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from its examples that this method is only applicable to the welding of dual-phase steels of 780MPa and below, and the cold-rolled dual-phase steels of 980MPa, due to its high alloy content and high carbon equivalent, are affected by welding heat during welding. The hardened martensite structure is easy to be produced in the hardened martensite zone, which is more sensitive to cracks, so its weldability is poor. Usin...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Production variety: DP980

[0031] Specifications: 1.8mm*1224mm

[0032] The strip is welded using a narrow lap welder on a continuous annealing line.

[0033] Welding process: the strip tail of the front coil and the strip head of the rear coil are cut at the entrance, and then overlapped with each other for welding.

[0034] Welding process: welding current 23KA; welding speed 8m / min; welding wheel pressure 25KN; welding overlap 1.7mm; welding compensation 1.2mm.

[0035] After the above-mentioned welding process, the weld seam is smooth and smooth, without nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cupping test. There was no broken belt accident caused by weld seam.

Embodiment 2

[0037] Production variety: DP980

[0038] Specifications: 1.5mm*1224mm

[0039] Welding process: the strip tail of the front coil and the strip head of the rear coil are cut at the entrance, and then overlapped with each other for welding.

[0040] Welding process: welding current 19.6KA; welding speed 8m / min; welding wheel pressure 23KN; welding overlap 1.7mm; welding compensation 1.2mm.

[0041] After the above-mentioned welding process, the weld seam is smooth and smooth, without nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cupping test. There was no broken belt accident caused by weld seam.

Embodiment 3

[0043] Production variety: DP980

[0044] Specification: 1.2mm*1224mm

[0045] The strip is welded using a narrow lap welder on a continuous annealing line.

[0046] Welding process: the strip tail of the front coil and the strip head of the rear coil are cut at the entrance, and then overlapped with each other for welding.

[0047] Welding process: welding current 19.1KA; welding speed 8m / min; welding wheel pressure 21.3KN; welding overlap 1.7mm; welding compensation 1.2mm.

[0048] After the above-mentioned welding process, the weld seam is smooth and smooth, without nodules, no weld scars, no weld penetration, and no cracks along the weld seam in the cupping test. There was no broken belt accident caused by weld seam.

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Abstract

The invention relates to a welding method for 980MPa-level cold-rolled dual-phase steel, and belongs to the technical field of steel strip welding. The welding method for the 980MPa-level cold-rolled dual-phase steel is provided for solving the technical problem. According to the method, a narrow lap welding machine is adopted for welding, and the strip tail of front rolled strip steel and the belt head of rear rolled strip steel are subjected to inlet shearing, and then are in lap joint for welding; and according to welding process parameters, the welding current ranges from 19 kA to 23 kA, the welding speed ranges from 6 m/min to 9 m/min, the welding wheel pressure ranges from 20 kN to 25 kN, the welding lap joint amount ranges from 1.5 mm to 1.7 mm, and the welding compensation amount ranges from 1.0 mm to 1.2 mm. The low-cost narrow lap welding machine is adopted for welding the 980MPa-level cold-rolled dual-phase steel, and a boldly innovative practice which breaks through the equipment limit and the product limit is achieved; and the existing narrow lap welding machine is adopted for welding the high-level dual-phase steel, equipment does not need to be modified, the cost of capital, production cost and equipment cost of the cold-rolled dual-phase steel are effectively reduced, and the aim of reducing the enterprise cost and increasing the enterprise benefits are achieved.

Description

technical field [0001] The invention relates to a welding method for 980MPa grade cold-rolled dual-phase steel, and belongs to the technical field of steel strip welding. Background technique [0002] Welding strip steel to realize continuous production of iron and steel enterprises is an important technological means to improve production efficiency and reduce production cost. It is widely used in production fields such as combined pickling and rolling production lines, continuous annealing production lines and continuous galvanizing and annealing production lines. The narrow lap welding machine belongs to resistance welding, which uses the resistance heating effect generated by the current to heat the welded workpiece between the compression and the electrode to a melting or shaping state, so that it can be combined. For 980MPa dual-phase steel, due to its high alloy content, high carbon equivalent, strong hardenability after welding, and high hardness in the heat-affecte...

Claims

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Application Information

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IPC IPC(8): B23K11/06B23K11/16B23K11/34B23K101/16B23K103/04
CPCB23K11/0026B23K11/06B23K11/16B23K11/34B23K2101/16B23K2103/04
Inventor 唐梦霞张晓宁熊凌荣王德宇胡阳洋
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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