Welding process of saf2205 duplex stainless steel and weldox700 low-alloy high-strength steel
A duplex stainless steel and welding process technology, which is applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve problems such as easy cracks, and achieve the effect of a reasonable process plan
Inactive Publication Date: 2016-03-16
NANTONG VOCATIONAL COLLEGE
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Problems solved by technology
Due to the high requirements for product manufacturing, and the quality of welding is directly related to the safety performance and service life of the product, welding defects such as cracks are easily generated during the welding process.
Method used
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[0018] like figure 1 , 2 Shown, a kind of welding process of SAF2205 duplex stainless steel 21 and WELDOX700 low-alloy high-strength steel 22, described welding process uses electrode arc welding to weld SAF2205 duplex stainless steel 21 and WELDOX700 low-alloy high-strength steel 22, does not preheat during welding , Multi-layer multi-pass welding is used in the welding process. Copper plates are used to protect the back and heat-affected zones of the welding surface during welding, and arc-extinguished welding is used on the front side during bottom welding. For the multi-layer and multi-pass welding used in the welding process, each layer of weld seam should be thoroughly cleaned and polished before welding the next layer of weld seam. Multi-layer multi-pass welding is used in the welding process, and the temperature between layers is controlled at 20-100 °C during welding. The welding joint of the welding process adopts a Y-shaped groove. The welded joint adopts a Y-sha...
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Abstract
The invention discloses welding process for SAF2205 duplex stainless steel and WELDOX 700 low alloy high-strength steel. The welding process uses shielded metal arc welding to welding the SAF2205 and the WELDOX 700, preheating is avoided, multi-layer and multi-pass welding is utilized in a welding process, the backs and heat-affected zones of SAF2205 and the WELDOX 700 are cushioned and protected through copper plates in welding, and the front sides of the SAF2205 and the WELDOX 700 are welded through extinguishing arc welding in backing weld. The welding process in reasonable in process scheme, uses E309MoL-17 welding wires to carry out multi-layer and multi-pass welding, can enable a welding joint area to be a bidirectional organization of austenite and ferrite, enables welding between the SAF2205 and the WELDOX 700 to obtain satisfied joint quality and meets the requirements for mechanical property.
Description
technical field [0001] The invention belongs to the field of welding technology of chemical materials, and in particular relates to a welding technology of SAF2205 duplex stainless steel and WELDOX700 low-alloy high-strength steel. Background technique [0002] Duplex stainless steel refers to stainless steel mainly composed of any two phases of austenite, ferrite or martensite, but usually refers to austenite-ferrite duplex stainless steel. This type of steel combines the characteristics of austenitic and ferritic stainless steels. Compared with ferritic stainless steel, it has high toughness, low ductile-brittle transition temperature, significantly improved intergranular corrosion resistance and weldability, and at the same time retains the characteristics of ferritic stainless steel, such as high thermal conductivity, small expansion coefficient, and superplasticity. ; Compared with austenitic stainless steel, the yield strength and fatigue strength are significantly im...
Claims
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IPC IPC(8): B23K9/025B23K9/035B23K33/00B23K9/23B23K103/18
Inventor 马敏莉崔恒兵陈旭东
Owner NANTONG VOCATIONAL COLLEGE