Method of welding dissimilar steel 10Cr9Mo1VNb and 1Cr18Ni9

A 1cr18ni9, welding method technology, applied in the field of special steel pipe welding, can solve the problems of difficult welding, brittle cold cracks of welded joints, and decreased impact toughness of welds, etc.

Inactive Publication Date: 2007-08-08
WORKER WELDING & CUTTING TECHN ASSOC OF HEBEI
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Problems solved by technology

The welding of T91 steel is relatively difficult, which is mainly manifested in the problems of oxidation on the back of the weld, embrittlement of welded joints, cold cracks, and low impact toughness. The main reason is that during the welding process, the welding line energy is large and the interlayer temperature is high. As a result, the interlayer structure is overheated, resulting in Widmanstatten structure, large grains and network grain boundaries. These structures are prone to crack sources, forming cracks and expanding, resulting in a decrease in the impact toughness of the weld

Method used

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  • Method of welding dissimilar steel 10Cr9Mo1VNb and 1Cr18Ni9

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Experimental program
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Embodiment approach

[0014] 1. Welding method

[0015] The welding method adopts the combination of manual argon tungsten arc welding and the welding method of workpiece rotation with the installation of a welding positioner. The displacement pulse argon tungsten arc welding process has a beautiful appearance and is used for mass production; Dissimilar steel with flexible handling for narrow construction sites.

[0016] 2. Selection of welding process parameters

[0017] 2.1 preheating,

[0018] According to the data, the characteristics of the two steels are analyzed as follows:

[0019] ① 10Cr9Mo1VNb steel (T91) belongs to the air-cooled martensitic structure and is sensitive to cold cracks;

[0020] ②Due to reasons such as steel materials, welding materials, and manual welding processes, hydrogen may remain in the weld in a supersaturated state during martensitic transformation, making the area embrittled;

[0021] ③The phase transformation after welding, coupled with the structural restrai...

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Abstract

The invention provides a method for the welding of steels like 10Cr9Mo1VNb and 1Cr18Ni9, which controls the temperature between 150-200deg.C before welding at the layer. With the back welding current being 115A/85A(peak/base), welding speed 2-3cm/min, thickness no less than 3mm, filling welding current 150A/20A (peak/base), welding speed 2-3cm/min, width of the welding channel being 2-3 times of the solder wire. It has smaller welding depth, reasonable control of the fuse ratio and chemical effusion.

Description

technical field [0001] The invention relates to a welding method of dissimilar steel 10Cr9Mo1VNb and 1Cr18Ni9, belonging to the technical field of special steel pipe welding. Background technique [0002] Dissimilar steel 10Cr9Mo1VNb (T91 steel) is a new type of high-alloy heat-resistant steel, which is widely used for its high-temperature durable strength and excellent creep fracture resistance. Compared with austenitic steel, it has a small expansion coefficient and improves heat conduction The price is also relatively cheap; whether it is in terms of performance or economy, it has shown its superiority. It is the first choice and alternative steel grade for high-temperature and high-pressure pipelines such as high-temperature superheater headers and main steam pipelines. The welding of T91 steel is relatively difficult, which is mainly manifested in the problems of oxidation on the back of the weld, embrittlement of welded joints, cold cracks, and low impact toughness. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/095B23K35/02B23K35/24B23K9/235B23K33/00B23K103/18
Inventor 王宝才王志伟王迎军焦荣格孙芳何生贵杨全义
Owner WORKER WELDING & CUTTING TECHN ASSOC OF HEBEI
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