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Welding method of composite steel plates

A welding method and technology for clad steel plates, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problems of a small number of high-tech welders, low welding efficiency of pure manual welding, and welding seam failure, etc. The effect of reducing the formation of harmful tissues, avoiding the formation of harmful tissues, preventing diffusion and aggregation

Inactive Publication Date: 2020-01-17
HUBEI POLYTECHNIC UNIV
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Problems solved by technology

[0002] Stainless steel composite panels, especially heat-resistant stainless steel composite panels, are made of heat-resistant stainless steel and ordinary carbon steel Q345R through explosive welding, and are used to make pressure vessels used under high temperature conditions. The performance of anti-corrosion can also exert the strength and toughness of ordinary carbon steel, and it can also reduce the material cost compared with the pressure vessel made of pure thickened heat-resistant steel, but the quality of the welding seam of the composite plate is the key factor to ensure the safety of the pressure vessel. How to improve the quality and welding efficiency of composite plate welds is a relatively complex system engineering
[0003] Composite plate welding belongs to the welding of dissimilar materials. The welding of dissimilar materials adopts layered welding, but a transition layer welding is required between the cladding layer and the base layer. The transition layer welding will easily lead to dilution and condensation of weld metal material elements, resulting in weld microstructure It is easy to form brittle structures such as martensite, which will lead to cracks in the welding process or subsequent high-temperature and high-pressure use, and the weld seam will fail. Therefore, in order to ensure the quality of the weld seam, most of the welding methods currently used are manual welding, which requires High-level skilled welding workers welding, high requirements for skilled workers, pure manual welding welding efficiency is low, and the number of high-tech welders is small, these factors limit the efficiency of heat-resistant steel clad plate welding and guarantee the quality of welds

Method used

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  • Welding method of composite steel plates

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Embodiment Construction

[0021] Taking the 4mm316L+18mmQ345R composite board as an example, the welding of the composite board weld seam includes the following steps:

[0022] 1. Use a plasma cutting machine to process the composite panel into a symmetrical X-shaped bevel, the bevel angle is 60±1°, the bevel gap is 2mm, and the blunt edge size is 4mm.

[0023] 2. The bottoming weld of the base material on the composite material side is manually welded with J507 electrode, and the electrode is baked at 350°C for 2 hours before welding. The welding current is 250A-400A, the welding voltage is 28-32V, and the welding speed is 300-450mm / Min , The dry elongation is 15-25mm. After the primer is completed, knock off the coating, and use an angle grinder to polish the weld to be smooth and smooth.

[0024] 3. The base material filling seam (4) on the composite material side is welded by submerged arc automatic welding. The welding material is H08A welding wire. The welding current is 350A-500A, the welding vo...

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Abstract

The invention relates to a welding method of composite steel plates, is used for the field of welding of composite stainless steel plates. The composite plates are explosion-welded composite plates, base materials of the composite plates are Q345R, and composite materials are 316L heat-resistant stainless steel. The method includes the steps of groove machining, groove cleaning and plate combination, base layer welding of composite layer sides, welding of transition layers, welding of composite layers as well as welding of back base layers. According to the composite stainless steel plates welded with the technology, appearance of fissile and fragile structures during welding of the composite plates is avoided, welding cracks are avoided, the welding quality of the composite plates is improved, and the welding efficiency of the composite plates is improved.

Description

technical field [0001] The invention relates to a welding method of clad steel plates, which is mainly used in fields such as welding of stainless steel clad plates, so as to ensure the welding seam quality and welding efficiency of the clad plates. Background technique [0002] Stainless steel composite panels, especially heat-resistant stainless steel composite panels, are made of heat-resistant stainless steel and ordinary carbon steel Q345R through explosive welding, and are used to make pressure vessels used under high temperature conditions. The performance of anti-corrosion can also exert the strength and toughness of ordinary carbon steel, and it can also reduce the material cost compared with the pressure vessel made of pure thickened heat-resistant steel, but the quality of the welding seam of the composite plate is the key factor to ensure the safety of the pressure vessel. How to improve the quality and welding efficiency of composite plate welds is a relatively ...

Claims

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Application Information

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IPC IPC(8): B23K9/02B23K9/18B23K9/235B23K33/00B23K103/04
CPCB23K9/02B23K9/18B23K9/235B23K33/004B23K2103/04B23K2103/05
Inventor 陈微徐绍勇
Owner HUBEI POLYTECHNIC UNIV
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