Stainless steel composite steel pipe welding method

A welding method and composite steel pipe technology, applied in the field of steel pipe welding, can solve the problems of increased welding cost, low welding efficiency of manual welding, difficulty in ensuring the quality of root weld bead, etc., and achieve the effect of high welding efficiency

Inactive Publication Date: 2005-09-21
凌星中
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Problems solved by technology

In addition, when welding stainless steel composite steel pipes by fusion welding, welding materials with high alloy content must be used, which increases the welding cost. In addition, the welding efficiency of manual welding is also low, and the quality of the root weld is not easy to guarantee, which makes the composite pipe durable. Corrosive properties cause damage

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  • Stainless steel composite steel pipe welding method
  • Stainless steel composite steel pipe welding method

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Embodiment Construction

[0018] The welding steps of the stainless steel clad steel pipe of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] A. Machining the connection surfaces of stainless steel composite steel pipes 1 and 2 into a diagonal butt joint, such as figure 1 The bevel angle α is shown as 15°~20°. Clean the oil stains and oxides on the connecting surface and the adjacent pipe surface;

[0020] B. Place intermediate materials 3 and 4 on the connection surface and the adjacent pipe surface. The intermediate material is Ni-Cr-Si-B nickel-based material with strong diffusion ability, low melting point and good corrosion resistance.

[0021] C. Insert the convex pipe end 1 tightly into the concave pipe end 2 on the assembly clamping mechanism 9. After the induction heating coil 5 is placed near the connection surface, the two pipes are clamped and rigidly fixed together, so that when heated Unable to expand freely, the resulting therm...

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Abstract

This invention relates to pipe-welding method, especially for stainless steel compound pipe, mainly used to solve the defect that when welding compound pipe, it easily comes to gas hole and crackle, and improving the weld efficiency and lowering cost. The invention includes the following steps: washing the joint surface, coating intermediate material, assembling and clamping, induction heating to melt the intermediate material and actualize liquid diffusion weld. The method also can be used in welding other metal pipes.

Description

technical field [0001] The invention relates to a steel pipe welding method, in particular to a stainless steel composite steel pipe welding method. Background technique [0002] The welded connection of stainless steel clad steel pipes is usually welded by fusion welding using stainless steel welding materials. When the cladding and the base layer are mechanically combined, during butt welding, the gas and impurities existing between the base and the cladding enter the weld pool, resulting in pores in the weld. CN1354061A discloses a welding method for solving the welding porosity of composite steel pipes. Its technical solution is to first weld the stainless steel composite layer with argon arc welding, and the thickness of the welded meat is equal to the thickness of the stainless steel coating. For composite pipes with thick stainless steel cladding (such as ≥ 2mm), this method can be implemented in engineering, but when the stainless steel cladding is very thin (such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K20/14B23K20/16B23K33/00
Inventor 凌星中
Owner 凌星中
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