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Welding method of cupronickel weldment

A welding method and technology for welding parts, which are applied in welding medium, welding equipment, welding equipment, etc., can solve the problems of plasticity and toughness of welded joints, and coarse grains.

Active Publication Date: 2010-01-13
CHINA NAT CHEM ENG NO 14 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] After the weld seam and the heat-affected zone are subjected to heat cycles, the grains become thicker, and various brittle eutectics with low melting points appear at the grain boundaries, thereby significantly reducing the plasticity and toughness of the welded joint

Method used

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  • Welding method of cupronickel weldment

Examples

Experimental program
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Effect test

example 1

[0080] Example 1, for a cupronickel pipe with a specification of φ73×7.01mm,

[0081] 1) Process the groove of the welded joint of the weldment: the thickness of the weldment δ=7.01mm, the gap of the groove b=2.0mm, the blunt edge k=0.8mm, the angle of the groove α=75°;

[0082] 2) The form of the fixed welding seam during assembly; the fixed welding seam adopts the "bow bridge method";

[0083] 3) Select the welding wire, clean the welding wire and the surface of the weldment, and weld according to the welding process and operation requirements:

[0084] Welding processes include:

[0085] 1) Power polarity: DC positive.

[0086] 2) Preheating temperature and interlayer temperature: without preheating, the interlayer temperature is 120°C.

[0087] 3) The number of welding layers and the height of the welding seam: 3 layers of welding are used, and the height of each welding seam is controlled at about 3.5mm.

[0088] 4) Protective gas: Inflatable protection must be carrie...

example 2

[0098] Example 2, for a cupronickel pipe with a specification of φ60×3.8mm,

[0099] 1) Process the groove of the welded joint of the weldment: the thickness of the weldment δ=3.8mm, the gap of the groove b=1.5mm, the blunt edge k=0.3mm, the angle of the groove α=70°;

[0100] 2) The form of the fixed welding seam during assembly; the fixed welding seam adopts the "bow bridge method";

[0101] 3) Select the welding wire, clean the welding wire and the surface of the weldment, and weld according to the welding process and operation requirements:

[0102] Welding processes include:

[0103] 1) Power polarity: DC positive.

[0104] 2) Preheating temperature and interlayer temperature: no preheating.

[0105] 3) The number of welding layers and the height of welding seam: single-layer welding is adopted.

[0106] 4) Protective gas: Inflatable protection must be carried out inside the tube, and a gas protective cover is not required outside the tube. Argon is used as the prote...

example 3

[0117] Example 3, for a cupronickel pipe with a specification of φ100×15mm,

[0118] 1) Process the groove of the welded joint of the weldment: the thickness of the weldment δ = 15mm, the gap of the groove b = 3mm, the blunt edge k = 1mm, and the angle of the groove α = 65°;

[0119] 2) The form of the fixed welding seam during assembly; the fixed welding seam adopts the "bow bridge method";

[0120] 3) Select the welding wire, clean the welding wire and the surface of the weldment, and weld according to the welding process and operation requirements:

[0121] Welding processes include:

[0122] 1) Power polarity: DC positive.

[0123] 2) Preheating temperature and interlayer temperature: preheat 130°C before welding; during multilayer welding, the interlayer temperature should not be lower than 140°C.

[0124] 3) The number of welding layers and the height of the welding seam: 5 layers of welding are used, and the height of the welding seam of each layer is controlled at abo...

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Abstract

The invention relates to a welding method of a cupronickel weldment, comprising the following steps: (1) processing a welding joint groove of the weldment: determining a gap and an angle of the groove according to the width of the weldment; (2) determining the form of a fixing welding line during assembly; and (3) selecting welding wires, cleaning the welding wires and the surfaces thereof and welding according to a welding technology and operation requirements. The welding method has good economic benefits and social benefits.

Description

technical field [0001] The patented technology relates to a welding method, in particular to a welding method for cupronickel weldments. Background technique [0002] The copper-nickel alloy containing less than 50% nickel is called white copper, which has high chemical stability in seawater, organic acids and various salt solutions, and has excellent corrosion resistance and cold and hot workability. It is widely used in Chemical industry, precision machinery, marine engineering. [0003] Because nickel is infinitely solid-soluble in copper, white copper has a single α-phase structure, good plasticity and easy processing. The mechanical properties and physical properties of white copper are as follows: [0004] [0005] Its thermal conductivity is close to that of carbon steel, and its welding performance is better than that of copper, brass, and bronze. It is easy to have the following problems during welding: [0006] A. The fluidity of the molten pool metal is poor...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/02B23K9/095B23K9/235B23K33/00B23K35/30B23K35/32B23K35/38B23K103/12
Inventor 崔定龙胡秋英黄小刚陈申付吴银志张伟波
Owner CHINA NAT CHEM ENG NO 14 CONSTR
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