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Stainless steel welding protecting agent

A protective agent, stainless steel technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as back oxidation and oxide inclusions

Inactive Publication Date: 2008-04-30
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a stainless steel welding protectant, which is suitable for anti-oxidation protection of stainless steel and other steel types with a nickel content of less than 25%, and solves the backside oxidation and oxide inclusions during welding of stainless steel and other nickel-containing steel types. and porosity problems, which is beneficial to the formation of uniform and beautiful welds of this type of steel and the realization of single-sided welding and double-sided forming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh the main ingredients NaF 15%, Al powder 35%, CaCO 3 40%, manganese powder 10%, ground into a mixed powder with a particle size of 10 μm to 20 μm, using the component powder + bentonite (mass ratio of main material and bentonite is 5:1) to mix and dilute with alcohol, the The protective agent material is coated on the back of A304 stainless steel with a thickness of 5mm, and is welded by manual arc welding. The welding voltage is 35V, the current is 150A, and the welding speed is 26m / h.

Embodiment 2

[0021] Weigh the main ingredients NaF 16%, Al powder 34%, CaCO 3 39%, manganese powder 11%, ground into a mixed powder with a particle size of 10 μm to 20 μm, use the component powder + clay (mass ratio of main material to clay is 8:1) to mix and dilute with alcohol, and apply the protective agent material Lay it on the back of 5mm thick A304 stainless steel and weld it by manual arc welding. Implementation process is the same as example 1.

Embodiment 3

[0023] Weigh the main ingredients NaF 17%, Al powder 33%, CaCO 3 38%, 12% manganese powder, ground into a mixed powder with a particle size of 10 μm to 20 μm, mixed with this component powder + kaolin (mass ratio of main material to kaolin is 6:1) and diluted with acetone, and coated with the protective agent material Lay it on the back of 5mm thick A304 stainless steel and weld it by manual arc welding. Implementation process is the same as example 1.

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Abstract

The invention discloses oxidation-resistant preservative materials of the welding back surface of non-corrosive steel, being mainly adaptable for the welding of non-corrosive steel of which the nickelic amount is less than 25% and other steel. The invention is composed of main materials, binding agent and deflocculating agent, wherein the main materials are powder of which the grain diameter is 10 mum to 20 mum. According to mass percent, the powder is composed of the components, including 15%-20% NaF, 30%- 40% Al powder, 35% - 40% CaCO3 and 10%- 15% manganese powder and the sum of the component is 100%. The mass ratio of the main materials and the binding agent is between 5 to 1 and 8 to 1. The preservative materials of the invention are coated on the back surface of the non-corrosive steel. In the time of welding, the invention is capable of preventing oxidation, abscess and oxidizing substances from being mixed, protecting the soldering seam, and resolving the oxidation problem of the back surfaces of the non-corrosive steel of which the nickelic amount is less than 25 % and other steel in the time of welding.

Description

technical field [0001] The invention relates to a welding anti-oxidation protective agent material, which is mainly suitable for welding stainless steel and other steel types with nickel content less than 25%. Background technique [0002] In oil fields, chemical industry and other industrial fields, the application of nickel-containing steels is becoming more and more common, and the corresponding stainless steel welding problems are also receiving more and more attention. In order to ensure the welding quality of stainless steel, argon arc welding is generally used as the welding method, but the oxidation problem on the back of the weld is difficult to solve. Many researchers have used the method of filling the back of the pipeline with argon protection to weld stainless steel, but this method consumes a large amount of argon, which will inevitably increase the project cost. How to prevent the oxidation of the back of the weld, oxide inclusions and pores and a series of p...

Claims

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Application Information

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IPC IPC(8): B23K35/38
Inventor 张敏刘斌
Owner XIAN UNIV OF TECH
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