904L stainless steel welding method

A welding process, stainless steel technology, applied in the direction of welding equipment, welding medium, welding equipment, etc., can solve the problems of prolonging the service life of welded parts, thermal cracks, etc., and achieve the effect of prolonging the service life

Inactive Publication Date: 2007-09-12
唐山三友集团化纤有限公司
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to address the defects of the prior art, to provide a welding and cold water cooling at the same time, without heat treatment after welding, so as to avoid the transformation of the internal properties and structure of stainless steel, and can prevent hot cracks, intergranular corrosion, and overall deformation after welding. A 904L stainless steel welding process method that minimizes defects and greatly prolongs the service life of welded parts

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Embodiment 1

[0019] The concrete welding example of the second bath tank that 904L stainless steel of the present invention makes:

[0020] The operation method is as follows:

[0021] 1. Machine tools and welding materials

[0022] (1) The welding equipment selects an inverter welding machine with good characteristics.

[0023] (2) Oil, dirt, burrs, etc. on the surface of the argon arc welding wire should be removed before use.

[0024] 2. Preparation before welding

[0025] (1) Cleaning: The production and preparation of edges or grooves generally adopt mechanical processing methods, and the welding seam should be cleaned with acetone within the range of 20-30mm.

[0026] (2) Butt joint assembly: welding wire of the same material as the weldment should be used for spot fixing before welding or clamped with clamps. That is, welding or spot welding must use welding wire that matches the base metal or strips cut from the base metal as welding wire.

[0027] (3) Narrow weld bead must be...

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Abstract

The 904L stainless steel welding process includes two steps, including manual tungsten pole argon arc welding and acid pickling and deactivating the weld seam surface. After being treated, the joints are welded with the welding wire of 904L and the weld seam is cooled with cold water, with the welding temperature being controlled below 80 deg.c, the welding speed being 45-50 cm/min, the weld seam depth/width ratio being kept in 1.5-2, and the welded workpiece having thickness not greater than 12 mm. The weld seam is then pickled and deactivated. The present invention has the advantages of low temperature welding, no molecule conversion inside 904L stainless steel, no generation of welding faults, less integrated deformation of the welded workpiece and long service life of the welded workpiece.

Description

technical field [0001] The invention relates to a special low-carbon duplex austenitic stainless steel welding process field, specifically a 904L stainless steel welding process method, Background technique [0002] 904L stainless steel has been widely used in aviation, chemical fiber, food and other industries with serious corrosion. All steel materials are imported from abroad. 904L stainless steel is a low-carbon duplex austenitic stainless steel, which has very strong corrosion resistance, but it is different from ordinary 304, Compared with 316L and 320 austenitic stainless steel, welding is difficult and difficult to master, and it is still a technical difficulty in our country. Therefore, in our chemical fiber company, the complete set of welding equipment (such as: second bath, jet pump, etc.) made of 904L on the most severely corroded spinning machine was introduced by Austrian Lenzing Company, which has the world's leading level of stainless steel welding technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/32B23K9/095B23K35/30B23K9/235B23K9/16B23K103/04
Inventor 李晓明肖立春李铁军李晓富
Owner 唐山三友集团化纤有限公司
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