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Thick-wall red copper and austenitic stainless steel non-prewarming arc melting and welding method

An austenitic stainless steel, welding method technology, applied in arc welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problem of difficult to guarantee welding quality, large loss of base metal performance, poor seawater corrosion resistance, etc. problems, to achieve the effect of preventing cracks, reducing the temperature of the molten pool, and increasing the solidification temperature

Inactive Publication Date: 2008-12-17
中国船舶集团渤海造船有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding quality is not easy to guarantee, the weld performance (strength, plasticity, seawater corrosion resistance, etc.) is very poor, and the base metal performance loss is also great

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The specific implementation manner of the present invention is described below in conjunction with technical scheme.

[0019] Thick-walled red copper and austenitic stainless steel are welded by arc melting without preheating, the method and steps are as follows:

[0020] (1) Process the connecting part of the thick-walled copper to be welded and the austenitic stainless steel component into a "V"-shaped groove.

[0021] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0022] (3) Positioning welds are filled by helium tungsten arc welding Nickel-copper alloy welding wire welding, wherein the range of nickel and copper content ratio by weight percentage is 60%:40%, the welding current is 180A, the shielding gas is pure helium, the flow rate is 10-15L / min, and the diameter The tungsten electrode, the welding length of the tack weld is guaranteed to be 10mm, and the distance between the two ta...

Embodiment 2

[0026] The method and steps of welding thick-walled red copper and austenitic stainless steel are as follows:

[0027] (1) Process the connecting part of the thick-walled copper to be welded and the austenitic stainless steel component into a "V"-shaped groove.

[0028] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0029] (3) Positioning welds are filled by helium tungsten arc welding Nickel-copper alloy welding wire welding, wherein the range of nickel and copper content ratio by weight percentage is 65%:35%, the welding current is 200A, the shielding gas is pure helium, the flow rate is 12L / min, and the diameter The tungsten electrode, the welding length of the tack weld is guaranteed to be 13mm, and the distance between the two tack welds is 120mm.

[0030] (4) Weld seam bottom welding, using tungsten helium arc welding without preheating Nickel-copper alloy welding wire welding method, wh...

Embodiment 3

[0033] The method and steps of welding thick-walled red copper and austenitic stainless steel are as follows:

[0034] (1) Process the connecting part of the thick-walled copper to be welded and the austenitic stainless steel component into a "V"-shaped groove.

[0035] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0036] (3) Positioning welds are filled by helium tungsten arc welding Nickel-copper alloy wire welding, wherein, the range of nickel and copper content ratio by weight percentage is 70%:30%, the welding current is 400A, the shielding gas is pure helium, the flow rate is 15L / min, and the diameter The tungsten electrode, the welding length of the tack weld is guaranteed to be 15mm, and the distance between the two tack welds is 150mm.

[0037] (4) Weld seam bottom welding, using tungsten helium arc welding without preheating Nickel-copper alloy welding wire welding method, wherein t...

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PUM

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Abstract

The invention discloses a non-preheating electric arc melting welding method of thick-wall red copper and austenitic stainless steel, which includes the following processing steps: 1. the method adopts tungsten electrode helium arc welding added with nickel-copper alloy welding wires of Phi 2 to 4mm for welding; the welding current is 180 to 400A; protective gas is pure helium, the flow volume of which is 10 to 15L per minute; the diameter of the tungsten electrode is Phi 4 to 5mm; the length for positioned welded joints is 10 to 15mm and the distance between the two welded joints is 100 to 150mm; 2. the method adopts the tungsten electrode helium arc welding added with the nickel-copper alloy welding wires of Phi 2 to 4mm for welding under the non-preheating condition; the welding current is 180 to 400A; the protective gas is helium, the flow volume of which is 10 to 15L / min; 3. after the backing welding, the non-preheating welding is used for filling the welded joint. The method solves the problems of the non-preheating welding of the thick-wall red copper and austenitic stainless steel and the hot cracking trend, which improves the solidification temperature, strength and plasticity of the welded joint and prevents the hot cracking and stomata by adding the nickel-copper alloy welding wire by hand.

Description

technical field [0001] The invention relates to a welding method, in particular to a non-preheating arc melting welding method of thick-walled red copper and austenitic stainless steel. Background technique [0002] The thermal conductivity, linear expansion coefficient and shrinkage rate of red copper and austenitic stainless steel are quite different. The welding of red copper requires preheating before welding and simultaneous heating during welding; austenitic stainless steel generally does not need preheating, and manual arc welding, inert gas shielded welding, plasma arc welding, etc. can ensure the realization of welding. At present, the flame brazing method is mostly used for welding red copper and austenitic stainless steel dissimilar materials. When welding, it needs to be preheated above 550°C. The welding conditions are very harsh and the labor efficiency is low. If a stainless steel weld is used, hot cracks will occur when the copper content of the weld reaches...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K9/095B23K103/22
Inventor 刘殿宝刘放李海涛魏兴明陈凯
Owner 中国船舶集团渤海造船有限公司
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