TIP TIG welding process of duplex stainless steel

Abstract

The invention provides a TIP TIG welding process of the duplex stainless steel. The TIP TIG welding process comprises the following steps of 1, preparation of welding material and formulation of welding process, 2, welding groove machining, 3, pre-welding preparation. 4, welding of duplex stainless steel, and 5, weld joint detection. According to the TIP TIG welding process , by means of the semi-automatic TIP TIG welding process, the problems that the existing duplex stainless steel manual GTAW welding speed is low, the welding efficiency is low, and the submerged-arc welding SAW welding position is limited are solved, the welding quality can be guaranteed, the welding efficiency can be improved, and semi-automatic full-position welding in the duplex stainless steel high-quality, high-efficiency, full-working-condition and full-thickness range is realized; the welding quality is ensured, the welding current is reduced, the welding heat input is reduced, the heat affected zone is reduced, the welding thermal deformation is low, the surface forming of the weld joint is good, and the operation controllability is high; and the welding efficiency is improved, and the full-position welding of the duplex stainless steel can be realized in a workshop or a field construction site.

Description

【Technical field】 [0001] The invention relates to a stainless steel welding process, in particular to a TIP TIG welding process of duplex stainless steel. 【Background technique】 [0002] Duplex stainless steel refers to a type of stainless steel whose microstructure consists of two phases of ferrite and austenite. It has the advantages of both ferritic stainless steel and austenitic stainless steel, and has good plasticity, toughness, strength and corrosion resistance. It has a wide range of applications in petrochemical, energy industry, transportation and many other fields. Duplex stainless steel is difficult to weld during welding, and the welding parameters have a great influence on the metallographic structure of the welded joint, which directly affects the performance of the welded joint. If the line energy used in the welding process is too low and the cooling rate is too fast, excessive ferrite and nitride will be produced in the weld seam and heat-affected zone, th...

AI Technical Summary

Problems solved by technology

[0003] The traditional welding methods of duplex stainless steel are manual GTAW welding and submerged arc welding SAW welding. Although the traditional GTAW welding method guarantees the welding quality, the operation is complicated, the operation is slow, the wire feeding speed is slow, the welding speed is slow, and the welding efficiency is low; The application of the submerged arc welding SAW welding method on duplex stainless steel has greatly improved the welding efficiency of duplex stainless steel, but the application range of submerged arc welding SAW is narrow, and is limited by the welding place and welding position. For the welding of thicker weldments, and its welding position is limited to the flat welding position

Therefore, the welding technology that can not only ensure the welding quality, but also improve the welding efficiency and realize all-position welding needs to be developed.

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