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Method for welding dissimilar material welded joint of composite plate

A technology of welding joints and welding methods, which is applied in the direction of welding/welding/cutting articles, welding equipment, arc welding equipment, etc., can solve the problems of corrosion resistance reduction, welding cracks on the joint surface of composite plates, etc., and achieve the effect of easy operation

Active Publication Date: 2015-12-09
青岛兰石重型机械设备有限公司
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Problems solved by technology

[0004] The purpose of the invention is to solve the problems of reduced corrosion resistance of the welded joint between the stainless steel clad plate and the austenitic stainless steel, welding cracks at the joint surface of the clad plate, etc.

Method used

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  • Method for welding dissimilar material welded joint of composite plate

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Embodiment Construction

[0020] The specific implementation cases of the patent of the present invention will be explained in detail with reference to the drawings.

[0021] In this case, the composite plate uses 14Cr1MoR as the base layer with a thickness of 20mm, and uses austenitic stainless steel S32168 as the composite layer with a thickness of 3mm; the austenitic stainless steel material is S32168 with a thickness of 24mm. The following welding measures are adopted for the welding of the stainless steel clad plate:

[0022] 1) Machining the groove and removing the layer of the groove of the composite board, such as figure 1 Shown

[0023] 2) Grind and remove the oil rust on the Cr-Mo material at the groove part to a metallic luster, and clean the composite layer within 100mm around the groove of the composite plate to be welded and remove the oil within 100mm around the groove of the austenitic stainless steel material;

[0024] 3) The bevel of the composite plate is coated with chalk powder for protec...

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Abstract

The invention provides a method for welding a dissimilar material welded joint of a composite plate, belongs to the field of dissimilar material welding of composite plates of pressure vessels, and aims to solve the problems that the corrosion resistance at the welded joint part is reduced, welding cracks easily occur in the joint face of a composite plate and the like. According to the technical scheme, the method mainly comprises the following steps: processing a groove, removing the clad layer and oil rust on the periphery of the groove until the periphery of the groove has metal luster; surfacing from the bottom of the groove, surfacing the insulating layer on the side of the composite plate, and performing stress relieving annealing thermal treatment on the composite plate; welding by adopting small-sized welding rods in a multi-layer and multi-pass welding manner; and performing butt welding on the composite plate and an austenitic stainless steel material, performing manual tungsten argon arc welding for the backing weld, filling the weld pass by adopting shielded metal arc welding, small-size, small thermal input, short arc quick welding and multi-layer multi-pass welding. The method can be used for welding a dissimilar material welded joint between a Cr-Mo low-alloy steel / carbon steel-austenitic stainless steel composite plate and austenitic stainless steel, has excellent welded joint quality, and can be used for overcoming the defect of the prior art.

Description

Technical field [0001] The invention belongs to the technical field of pressure vessel welding, and particularly relates to the welding of composite plates of dissimilar materials for pressure vessel equipment manufacturing. Background technique [0002] The stainless steel clad plate for pressure vessel shell is mainly made of low alloy steel as the base layer and austenitic stainless steel material as the clad layer. The clad steel plate made by explosive welding and other methods, the thickness of the clad layer is generally more than 3mm. It combines the good mechanical properties, processing properties and corrosion resistance of stainless steel of low alloy steel, and is mainly used for high corrosion requirements. Storage tanks, towers, reactors and other equipment. Pressure vessel nozzle flanges sometimes use austenitic stainless steel forgings. [0003] The welding between the stainless steel clad plate and the austenitic stainless steel material is mainly divided into t...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/00B23K9/04B23K9/235B23K9/02B23K101/18B23K103/16
CPCB23K9/00B23K9/02B23K9/042B23K9/167B23K9/235
Inventor 孔凡红王天先类成龙师清豪于磊
Owner 青岛兰石重型机械设备有限公司
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