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Welding method for cold-rolled 25# steel solid laser welding machine

A solid-state laser, welding method technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of welding seam quality defects, inability to obtain laser welding process combination parameters, increasing orders, etc. The effect of product manufacturing capabilities

Inactive Publication Date: 2020-04-17
XINJIANG BAYI IRON & STEEL
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Problems solved by technology

The main characteristics of 25# steel raw materials are high w(C) and w(Mn) and low w(S) and w(P). -The annealing process can fully guarantee the quality of the weld seam. Bayi Iron and Steel Co., Ltd. uses Wuhan Kaiqi laser welding machine. This laser welding machine is not equipped with preheating and annealing devices, so that the welding machine does not fully exert its design capabilities and is facing production line production. Due to the trend of frequent replacement of steel specifications and increasing orders for high-strength and high-grade steel, the actual production process obviously fails to meet the production requirements, and the unreasonable process parameters lead to weld quality defects and multiple belt breakage accidents, because the best quality cannot be obtained. The combined parameters of the laser welding process for high-strength and difficult-to-weld steel make it impossible for high-strength steel to be mass-produced and supplied

Method used

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  • Welding method for cold-rolled 25# steel solid laser welding machine
  • Welding method for cold-rolled 25# steel solid laser welding machine

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Experimental program
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Effect test

example 1

[0009] 1. Laser welding machine welds 25# steel,

[0010] Export steel type (25#), thickness 3.0mm, imported steel type (25#), thickness 3.0mm, laser welding machine for welding, weld cupping test. After observing the shape of the weld seam and the appearance of the weld seam after cupping, it is concluded that in the absence of the weld seam preheating and annealing function device, the weld seam appears impenetrable or the material is brittle and causes cupping after welding. Cracked imagination.

[0011] 2. By judging the quality of the weld, breaking through the limitations of the laser welding machine's own preheating and annealing functions, researching and adjusting the welding process parameters, and conducting a large number of welding experiments, the welding parameters are selected in the following table:

[0012]

[0013] According to the experimental results, the welding test 5 is selected as the optimal welding parameter (standard correction of the transmissi...

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Abstract

The invention discloses a welding method for a cold-rolled 25# steel solid laser welding machine. The welding process parameters are as follows: the thickness of strip steel is 3.0 mm, the welding speed is 2.5, the welding power is 6800, the defocusing amount is -8, the welding pressure is 25, the butt joint gap is 0.25 os, the butt joint gap is 0.25 ds, and the wire filling speed is 0; and the thickness of strip steel is 3.5 mm, the welding speed is 2.3, the welding power is 6900, the defocusing amount is -8, the welding pressure is 30, the butt joint gap is 0.3 os, the butt joint gap is 0.3ds, and the wire filling speed is 0. The method can greatly improve the product manufacturing capacity of the cold rolling and acid coupling rolling unit, and can be applied to the fields of industrial mass production and the like.

Description

technical field [0001] The invention relates to a welding method of a cold-rolled 25# steel solid laser welding machine. Background technique [0002] The main characteristics of this strip steel raw material are high w(C) and w(Mn) and low w(S) and w(P). In June 2018, after the completion of the acid tandem rolling transformation of Bayi Iron and Steel Co., Ltd., with the improvement of equipment capacity, Bayi Iron and Steel Co. For the development and trial production of the new rolling product 25# steel, through exploring and studying the welding process parameters and improving the functional accuracy of the equipment, the trial production of the new product 25# steel has been organized many times to expand the capacity of cold-rolled products and improve the competitiveness of the cold-rolled market. [0003] Due to the important position of welding quality in the pickling mill, the selection of welding machine usually represents the technological equipment level of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21
CPCB23K26/21B23K2103/04
Inventor 邵彦生李进宝范振磊
Owner XINJIANG BAYI IRON & STEEL
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