Welding method of hastelloy tube

A welding method and technology of Hastelloy, applied in welding equipment, welding accessories, metal processing and other directions, can solve the problems of poor thermal conductivity, not easy to melt, and lack of penetration, to prevent oxidation and poor forming, avoid cracks, The effect of preventing molding defects

Inactive Publication Date: 2017-05-31
CHINA NAT CHEM ENG NO 14 CONSTR
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Problems solved by technology

[0006] Reasons for incomplete penetration: The heat input during C-276 welding cannot be too large and the fluidity of the C-276 weld pool is poor. In addition, the weld metal has a shallow penetration depth, so it is easy to form incomplete penetration defects
[0007] The reason for the large tendency of slag inclusion: due to the poor thermal conductivity of the material, it is easy to produce grooves or undercuts on both sides of the weld bead to affect the welding of the next weld bead, the melting speed at the front of the molten pool and the base metal is slow, and the surface shape of the weld bead is defective Not easy to melt, improper handling will cause slag inclusion between layers

Method used

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  • Welding method of hastelloy tube
  • Welding method of hastelloy tube
  • Welding method of hastelloy tube

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Embodiment Construction

[0034] Such as figure 1 As shown, the Hastelloy tube welding method disclosed in the present invention includes the following steps:

[0035] Step 1, preparation before welding, the specific steps are:

[0036] Step 1.1, bevel preparation, the pipe welding position is made into a bevel in the form of a large angle and a small blunt edge;

[0037] Step 1.2, clean up before welding, clean up oil stains, burrs, rust spots and oxide scale within 20mm on both sides of the groove on the inner and outer surfaces of the pipe;

[0038] Step 1.3: Weld joints are paired, and the pipes to be welded are welded to ensure that the inner wall is flush and the amount of misalignment is less than 10% of the wall thickness;

[0039] Step 1.4, install an argon gas protection device, install an argon gas protection device inside the opposite part of the weld seam group of the pipe, and protect the back of the weld seam with argon;

[0040] Step 1.5, tack welding, tack welding is performed at equal intervals ...

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Abstract

The invention provides a welding method of a hastelloy tube. The welding method comprises the steps of preparing before welding, fully welding, cleaning welding seams after welding and repairing the welding seams. By adopting the welding method of the hastelloy tube, the hastelloy tube can be smoothly welded, higher welding quality is obtained, and the qualified rate of the welding seams reaches 99%.

Description

Technical field [0001] The invention relates to a welding method, in particular to a welding method of Hastelloy tube. Background technique [0002] The electrical conductivity and thermal conductivity of Hastelloy alloy are much lower than that of low-carbon steel, while the resistivity and expansion rate are much higher than that of low-carbon steel. The molten pool has poor fluidity, poor wettability, low penetration, and shallow penetration. So it is easy to produce defects such as pores, cracks, incomplete penetration, lack of fusion, and slag inclusion. [0003] At present, in the process of Hastelloy welding, the causes of weld defects generally include: [0004] Causes of pores: The fluidity of liquid metal in nickel-based alloys is relatively poor, and the gas cannot escape in the liquid state; the temperature distance between solid and liquid phases of nickel-based alloys is small, and the solubility of oxygen, carbon dioxide and hydrogen in liquid nickel is relatively lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/16B23K9/02B23K9/32
CPCB23K9/235B23K9/02B23K9/16B23K9/32B23K2101/06
Inventor 高国民蒋加磊赵保勇
Owner CHINA NAT CHEM ENG NO 14 CONSTR
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