Method for welding Fe-Al intermetallic compound microporous material and welding part thereof

An intermetallic compound and welding method technology, which is applied in the field of welding and welding of Fe-Al intermetallic compound microporous materials and dense stainless steel, and welding of iron-aluminum-based intermetallic compound microporous materials. The mechanical properties of the joint and the discontinuity of the molten pool, etc., can achieve the effect of full and uniform welds.

Active Publication Date: 2020-05-15
AT&M ENVIRONMENTAL ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are many differences between microporous materials and dense materials. The main reason is that microporous materials have microporous structures. These micropores will have a serious impact on welding and other connection methods. The rate of heat transfer in materials is related to the porosity of materials. A large number of pores The existence of the welding makes it difficult to form a continuous and stable molten pool, which reduces the mechanical properties of the joint
In addition, due to the large difference in thermal expansion coefficient between Fe-Al and dense stainless steel, cold and hot cracking of the weld is prone to occur during the welding process and the subsequent cooling process; There are many pores in the large and microporous material itself, if the protection is not proper, it is easy to form Al 2 o 3 In the welding process, there is no melting or discontinuous molten pool. These factors make the welding between Fe-Al microporous materials and dense stainless steel very difficult.

Method used

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  • Method for welding Fe-Al intermetallic compound microporous material and welding part thereof
  • Method for welding Fe-Al intermetallic compound microporous material and welding part thereof
  • Method for welding Fe-Al intermetallic compound microporous material and welding part thereof

Examples

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Effect test

example 1

[0037] Fe 3 Al intermetallic compound pipes and 310S stainless steel connecting rings are welded. The argon arc welding welding process parameters are: current 65A, voltage 12.4V, welding speed 150mm / min, argon flow rate 20L / min, protective cover argon flow rate 10-15L / min, the wire material is GCrMo91 (C<0.1%wt, Cr<8~10%wt, Mo<1%wt) heat-resistant steel wire as welding filler. The weld seam is full and uniform, without undercut, surface cracks, lack of meat, obvious weld bumps, internal cracks, inclusions and other defects. The welding tensile strength is 37MPa.

example 2

[0039] Fe 3 Al intermetallic compound pipes and 310S stainless steel connecting rings are welded. The welding process parameters of argon arc welding are: current 70A, voltage 12.4V, welding speed 180mm / min, argon gas flow rate 20L / min, protective cover argon gas flow rate 10-15L / min, the welding wire material uses ER310S welding wire as welding filler. The weld seam is full and uniform, without undercut, surface cracks, lack of meat, obvious weld bumps, internal cracks, inclusions and other defects. The welding tensile strength is 39MPa.

example 3

[0041] Fe 3 Al intermetallic compound pipes and 304 stainless steel connecting rings are welded. The argon arc welding welding process parameters are: current 75A, voltage 12.4V, welding speed 210mm / min, argon gas flow rate 20L / min, protective cover argon gas flow rate 10-15L / min, the wire material uses ERNiCr-3 wire as the welding filler. The weld seam is full and uniform, without undercut, surface cracks, lack of meat, obvious weld bumps, internal cracks, inclusions and other defects. The welding tensile strength is 36MPa.

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Abstract

The invention discloses a method for welding an Fe-Al intermetallic compound microporous material and a welding part thereof, relates to the technical field of welding, and aims to solve the problem that the welding between an Fe-Al microporous material and compact stainless steel is very difficult. The method for welding the Fe-Al intermetallic compound microporous material comprises the steps ofstarting the gun gas of a fusion welding machine and starting the welding protective gas in a protective cover; adjusting welding parameters of the welding machine and parameters of the welding protective gas in the protective cover in the fusion welding process; starting the welding machine and using a welding wire as welding filler to weld the Fe-Al intermetallic compound microporous material with the compact stainless steel; and cooling after the welding is completed. By implementing the method for welding the Fe-Al intermetallic compound microporous material, the welded Fe-Al intermetallic compound microporous material is firmly combined with the compact stainless steel, the stability is high, the welding seam is complete and uniform, and the defects such as undercut, surface cracks and misrun are eliminated.

Description

technical field [0001] The present invention relates to the field of welding technology, in particular to the welding field of an iron-aluminum base (hereinafter referred to as Fe-Al) intermetallic compound microporous material, and more specifically to a kind of Fe-Al intermetallic compound microporous material and dense stainless steel (i.e. Solid stainless steel) welding field. Background technique [0002] Fe-Al intermetallic compounds (such as Fe 3 Al, FeAl, FeAl 2 , Fe 2 Al 5 , FeAl 3 etc.) is a low-density material between metal and ceramics, also known as "semi-ceramic", which has good ductility, high strength, good processing performance, high thermal shock resistance, and It has the advantages of welding and other advantages, and also has the characteristics of good thermal stability, high oxidation resistance and corrosion resistance, and good wear resistance of ceramic materials. It is especially suitable for precision filtration and gas-solid separation und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/28B23K9/133B23K26/14B23K26/12B23K26/70B23K10/02
CPCB23K9/16B23K9/287B23K9/133B23K26/14B23K26/12B23K26/703B23K10/02B23K26/21B23K2103/20B23K2103/05B23K9/232B23K26/20
Inventor 顾虎杨军军王凡刘冠颖张玉杨烜王琨林士玉
Owner AT&M ENVIRONMENTAL ENG TECH CO LTD
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