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Submerged automatic arc welding method of SA335P91 steel

A 1.SA335P91, submerged arc automatic welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of sensitive welding process and process parameters, inability to meet factory piping, large technical difficulties, etc., to achieve welding Stable and reliable seam quality, conducive to cost control, and the effect of reducing labor intensity

Active Publication Date: 2010-05-05
HENAN HUADIAN JINYUAN PIPING
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Problems solved by technology

[0002] SA335P91 steel is an improved 9Cr~1Mo martensitic heat-resistant alloy steel, which has good physical properties and high-temperature creep strength, but because of its high alloy content, there are greater technical difficulties in welding, and the welding process and process The parameters are very sensitive, and the problem of low weld toughness is prone to occur
Especially with the vigorous development of supercritical and ultra-supercritical power plant units above 600MW, there are more and more thick-walled pipes. The traditional manual operation can no longer meet the needs of factory piping, and has become an important factor restricting the level of piping.

Method used

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Embodiment Construction

[0035] like figure 1 As shown, in the SA335P91 steel submerged arc automatic welding method of the present invention, the preparatory work before submerged arc automatic welding includes first using argon arc welding wire for backing welding, and then using manual arc welding for welding.

[0036] The specific welding steps of argon arc welding are:

[0037] ①. First cut a groove at the place to be welded;

[0038] ②.Pair spot welding: clean the groove until it reveals the metallic luster, control the gap between the joints at 2-4mm, and use the "positioning block" method to fix it;

[0039] ③. Low-temperature preheating before argon arc welding: the preheating temperature is 150-200°C, and the constant temperature is kept for two hours;

[0040] ④. Argon arc welding primer: when argon arc welding, the inner wall of the pipe must be filled with argon or use argon-free protective agent for root protection to prevent root oxidation. Specification φ2.4mm, welding current 130-1...

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Abstract

The invention discloses a submerged automatic arc welding method of SA335P91 steel. After a welded junction is preheated, welding is carried out according to the following steps of backing welding by adopting an argon arc welding wire; manual arc welding; submerged automatic arc welding, integral heat treatment after welding and weld inspection. In the method, the working procedure of the backingargon arc welding is carried out before the submerged automatic arc welding so that root oxidation is prevented, the positioning problem of welding is ensured, and a good foundation for subsequent working procedures is provided. Along with the rapid development of supercritical units and the popularization and the application of SA335P91 materials in China, the welding technology can be widely applied to weld the welded junctions of the SA335P91 materials of four pipelines and boiler pipelines in factorial piping of supercritical units in heat power plants.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a SA335P91 steel submerged arc automatic welding method, which is mainly applied to the welding of SA335P91 material welding joints of four major pipelines and boiler pipelines in factory piping of supercritical units. Background technique [0002] SA335P91 steel is an improved 9Cr~1Mo martensitic heat-resistant alloy steel, which has good physical properties and high-temperature creep strength, but because of its high alloy content, there are greater technical difficulties in welding, and the welding process and process The parameter is very sensitive, and it is prone to the problem of low weld toughness. Especially with the vigorous development of supercritical and ultra-supercritical power plant units above 600MW, there are more and more thick-walled pipes. The traditional manual operation can no longer meet the needs of factory piping, which has become an importa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235
Inventor 牛文献李诗玉李俊峰
Owner HENAN HUADIAN JINYUAN PIPING
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