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Iron white copper and austenitic stainless steel arc melting and welding method

A technology of austenitic stainless steel and arc melting, applied in the direction of arc welding equipment, welding equipment, welding/welding/cutting items, etc.

Active Publication Date: 2011-03-16
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

At present, there are no ready-made standards in China for the welding of dissimilar materials between thick-walled pipes and their piping accessories and austenitic stainless steel.

Method used

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  • Iron white copper and austenitic stainless steel arc melting and welding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The specific implementation manner of the present invention is described below in conjunction with technical scheme.

[0017] The method and steps of welding thick-walled iron-nickel-nickel copper pipes with austenitic stainless steel are as follows:

[0018] (1) Groove the thick-walled iron-nickel-nickel copper pipe to be welded and the austenitic stainless steel component.

[0019] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0020] (3) Positioning welds are filled by argon tungsten arc welding Nickel-copper alloy wire welding, in the nickel-copper alloy wire, the content ratio of nickel and copper by weight percentage ranges from 62%:38%, welding current is 185A, the shielding gas is pure argon, the flow rate is 10L / min, and the diameter of the tungsten pole is use The length of the tack weld is 10mm, and the distance between two tack welds is 100mm.

[0021] (4) Formal welds are f...

Embodiment 2

[0023] The method and steps of welding thick-walled iron-nickel-nickel copper pipes with austenitic stainless steel are as follows:

[0024] (1) Groove the thick-walled iron-nickel-nickel copper pipe to be welded and the austenitic stainless steel component.

[0025] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0026] (3) Positioning welds are filled by argon tungsten arc welding Nickel-copper alloy wire welding, in the nickel-copper alloy wire, the content ratio of nickel and copper by weight percentage is 67%: 33%, the welding current is 200A, the shielding gas is pure argon, the flow rate is 12L / min, and the diameter of the tungsten electrode is use The length of the tack weld is 12mm, and the distance between two tack welds is 125mm.

[0027] (4) Formal welds are filled by manual tungsten argon arc welding Nickel-copper alloy wire welding, in the nickel-copper alloy wire, the content ra...

Embodiment 3

[0029] The specific implementation manner of the present invention is described below in conjunction with technical scheme.

[0030] (1) Groove the thick-walled iron-nickel-nickel copper pipe to be welded and the austenitic stainless steel component.

[0031] (2) Remove scale, oil, rust, water and other dirt within 30mm around the area to be welded, and wipe it clean with acetone.

[0032] (3) Positioning welds are filled by argon tungsten arc welding Nickel-copper alloy wire welding, in the nickel-copper alloy wire, the content ratio of nickel and copper by weight percentage is 69%: 31%, the welding current is 300A, the shielding gas is pure argon, the flow rate is 15L / min, the diameter of the tungsten electrode is use The length of the tack weld is 15mm, and the distance between two tack welds is 150mm.

[0033] (4) Formal welds are filled by manual tungsten argon arc welding Nickel-copper alloy wire welding, in the nickel-copper alloy wire, the content ratio range of...

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Abstract

The invention discloses an electric arc melting welding method of copper-nickel-iron alloy and austenitic stainless steel, which is an electric arc melting welding method that adopts the direct current welding power supply with the output current being more than 300A, uses pure helium as protective gas and adds nickel-copper alloy welding wires for welding a welded joint between a thick-wall large-diameter copper-nickel-iron alloy pipe and the austenitic stainless steel in the welding process. The method is characterized in that in the welding process, a tungsten electrode with the diameter of Phi3.2 to 4mm is adopted, the pure helium is used for protection and the nickel-copper alloy welding wires of Phi 2 to 4mm are added for welding; at the same time, the welding current is guaranteed to reach 180 to 300A and the flow volume of the protective gas is 10 to 15L per minute. The method has the positive effects of solving the problems of the welding of the welded joint between the thick-wall large-diameter copper-nickel-iron alloy and the austenitic stainless steel, so as to avoid the problem that hot cracking and stomata are easy to appear in the welding process.

Description

technical field [0001] The invention relates to a welding method, in particular to an arc melting welding method of iron-nickel-nickel copper and austenitic stainless steel. Background technique [0002] Iron nickel copper (such as BFe10-1-1 and BFe30-1-1) has good comprehensive mechanical properties and does not require preheating during welding. BFe10-1-1 and BFe30-1-1 and other iron-nickel alloys are copper-nickel alloys, there is no obvious phase transition process in the welding process, the linear expansion coefficient is high, and large stress and deformation will occur during welding. Impurities are very sensitive and easy to form hot cracks; at the same time, because nickel-nickel contains more nickel, nickel can sharply increase the solubility of hydrogen in copper, so the weld of nickel-nickel is very sensitive to hydrogen pores during welding. According to the carbon content, chromium-nickel content ratio, content of stabilizing elements titanium, niobium and ta...

Claims

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Application Information

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