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Narrow lap joint welding process for cold-rolled dual-phase steel strips

A welding process and dual-phase steel technology, applied in welding equipment, manufacturing tools, resistance welding equipment, etc., can solve the problem that the production capacity of the production line of narrow lap welding machines cannot be fully utilized, increase the production cost of enterprises, and reduce the economic benefits of enterprises and other problems to achieve the effects of avoiding weld fracture accidents, reducing capital costs, high plasticity and toughness

Inactive Publication Date: 2015-08-19
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, narrow lap welding machines cannot weld many high-strength, high-profit advanced high-strength steels such as dual-phase steels. Enterprises need to purchase expensive laser welding machines to produce the above-mentioned new varieties, which increases the production costs of enterprises and makes narrow lap joints The production capacity of the production line of the lap welding machine cannot be utilized, causing a lot of waste and reducing the economic benefits of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Production varieties: DP590 cold-rolled dual-phase steel strip.

[0021] Specification: 0.6*1000mm.

[0022] The strip steel is welded by a narrow lap welder on a continuous annealing line.

[0023] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0024] Welding process: welding current is 9KA; welding speed is 17m / min; welding wheel pressure is 1400KN; overlap is 0.6mm; .

[0025] The strip steel welded by the above welding process passes through the cleaning section, looper, heating furnace, skin pass unit, etc., and finally produces DP600 annealed finished products.

Embodiment 2

[0027] Production varieties: DP490 cold-rolled dual-phase steel strip.

[0028] Specifications: 1.2*1200mm.

[0029] The strip is welded with narrow lap welders on a continuous galvanizing line.

[0030] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0031] Welding process: welding current is 12KA; welding speed is 14m / min; welding wheel pressure is 1600KN; overlap is 0.7mm; .

[0032] The strip steel welded by the above welding process passes through the cleaning section of the galvanizing line, the looper, the heating furnace, the skin pass machine, etc., and finally produces the DP490 galvanized finished product. .

Embodiment 3

[0034] Production varieties: DP780 cold-rolled dual-phase steel strip.

[0035] Specifications: 2.0*1250mm.

[0036] The strip is welded with narrow lap welders on a continuous galvanizing line.

[0037] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0038] Welding process: welding current is 22KA; welding speed is 10m / min; welding wheel pressure is 2000KN; overlap is 0.8mm; .

[0039] The strip steel welded by the above welding process passes through the cleaning section, looper, heating furnace, skin-passing unit, etc., and finally produces DP780 galvanized finished products.

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Abstract

The invention discloses a narrow lap joint welding process for cold-rolled dual-phase steel strips and belongs to the technical field of steel strip welding processes. A narrow lap joint resistance welding machine is utilized to weld the cold-rolled dual-phase steel strips. According to the technical scheme, the welding process conditions include that welding current is 9-26 KA, welding speed is 6-13m / min, the welding wheel pressure of the welding machine is 6.5-13KN, the lap joint amount of the tail portion of a previous steel strip roll and the heat portion of a later steel strip roll is 0.4-2.0 mm, and compensation amount is 0.25-0.7 mm. The narrow lap joint welding process is a bold trial, the design limits on the strength, component and the like of the narrow lap joint resistance welding machine are broken through, and narrow lap joint welding operation of the cold-rolled dual-phase steel strips is achieved through innovative operation. The narrow lap joint resistance welding machine on an existing processing line of an enterprise can be used for welding the cold-rolled dual-phase steel strips, the functions of the existing production line are greatly widened, the fund cost, production cost and device cost of the cold-rolled dual-phase steel strips are effectively reduced, and huge economic benefit is brought to the enterprise.

Description

technical field [0001] The invention relates to a welding process for cold-rolled dual-phase steel strips, in particular to a welding process for welding cold-rolled dual-phase steel strips by using a narrow lap resistance welding machine, and belongs to the technical field of strip steel welding processes. Background technique [0002] Strip welding is a necessary process for the continuous production of strip steel. During welding, a welding machine is used to connect the strip heads and tails of two adjacent coils of strip steel to realize the continuous production of steel enterprises. For continuous annealing and galvanizing production lines, the weld seam of the strip steel after welding has to undergo multiple turns, reverse bending, high temperature insulation, etc. on the production line with high tension, so the quality requirements for the strip steel weld seam are very high. The quality must not only have a certain strength, but also have high plasticity and toug...

Claims

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Application Information

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IPC IPC(8): B23K11/02
CPCB23K11/02
Inventor 杨丽芳于世川周国平孙力李建英杨杰弓俊杰夏明生周雪峰韩冰魏焕君贾慧淑杨青王春平贺海清
Owner TANGSHAN IRON & STEEL GROUP
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