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Plasma-arc welding method of cupronickel with thickness of 2-20 mm

A plasma arc and cupronickel technology, applied in plasma welding equipment, welding equipment, arc welding equipment, etc., can solve the problems of unseen plasma arc welding cupronickel, and achieve the effect of small welding deformation, improved welding quality and good welding quality

Inactive Publication Date: 2010-06-30
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are no relevant reports on plasma arc welding of nickel copper in China.

Method used

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  • Plasma-arc welding method of cupronickel with thickness of 2-20 mm
  • Plasma-arc welding method of cupronickel with thickness of 2-20 mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Butt welding of B10 plates with a thickness of 2mm and a length of 300mm was carried out by using the method of plasma arc welding of cupronickel. The welding process was stable and there were no welding defects. I-type groove, plasma arc welding, one-time welding, the welding process parameters used are as follows:

[0030] Welding Base Metal Welding Welding Welding Wire Feed Shielding Shielding Gas Flow

[0031] Mode Thickness Current Voltage Velocity Velocity Gas Plasma Arc Gun Protection

[0032] mm A V mm / min mm / min L / min L / min

[0033] Flat welding 2 80 18-20 300 600 Pure argon 3 20

Embodiment 2

[0035] Using the method of plasma arc welding cupronickel, carried out Butt welding of the circular seam of the B10 barrel, the welding process is stable, the appearance quality of the weld is good, and the non-destructive testing of the weld is qualified.

[0036] I-type groove is adopted, and plasma arc welding is welded at one time. The process parameters are as follows:

[0037] Welding Base metal Welding Welding Welding Wire feeding Shielding Shielding gas flow L / min

[0038] Mode Thickness Current Voltage Velocity Velocity Gas Plasma Arc Gun Protection

[0039] mm A V mm / min mm / min L / min L / min

[0040] Horizontal welding 4 120 20-22 250 800 Pure argon 4 25

Embodiment 3

[0042] Using the method of plasma arc welding cupronickel, carried out The B30 barrel longitudinal seam welding, the welding process is stable, the appearance quality of the weld seam is good, and the nondestructive inspection of the weld seam is qualified.

[0043] Using I-type groove, plasma arc welding, one-time welding, the process parameters are as follows:

[0044] Welding Base Metal Welding Welding Welding Wire Feed Shielding Shielding Gas Flow

[0045] Mode Thickness Current Voltage Velocity Velocity Gas Plasma Arc Gun Protection

[0046] mm A V mm / min mm / min L / min L / min

[0047] Flat welding 7.5 230 22-24 220 800 Pure argon 4 25

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Abstract

The invention relates to a plasma-arc welding method of cupronickel with the thickness of 2-20 mm, comprising the following steps of: measuring divided edge reference dimension and adopting a welding mode; setting parameters before welding; and setting process parameters in a welding process, wherein a divided edge includes an I-shaped divided edge and a U-shaped divided edge; the welding mode includes downward welding and horizontal welding or vertical welding; the process parameters in the welding process are set by selecting different welding currents, welding voltages, welding speeds and wire feed speeds according to different thicknesses of the cupronickel plates; protective gases are all pure argon; plasma gas flow rate is not less than 3-10 L / min; and welding gun gas flow rate is not less than 15-25 L / min. The invention has the advantages of stable welding process, high welding efficiency and welding seam qualification rate and good welding seam quality and outstanding economic benefit, and can effectively enhance the welding quality and the production efficiency of cupronickel materials.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a method for plasma arc welding of 2-20mm thick white copper. Background technique [0002] The welding methods currently applied to cupronickel mainly include manual argon arc welding, manual arc welding, gas welding, etc. The above welding methods need to process a certain angle of groove, but for the welding of formed pipes or pipe fittings, the welding groove generally cannot It is realized by machining, which can only be ground by hand, and the work efficiency is low. Moreover, the above-mentioned welding method has the disadvantages of many welding passes, wide welding heat-affected zone, large welding residual stress, large welding deformation, and low welding efficiency. It has become an important factor restricting the production of cupronickel products. [0003] The energy of the plasma arc is quite concentrated, the arc flame has a very high temperature, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02B23K9/095B23K9/16B23K33/00
Inventor 张建欣刘希林贾晓飞
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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