Laser-arc hybrid welding solid welding wire for high-manganese austenite low-temperature steel and welding process

Abstract

The invention relates to a laser-arc hybrid welding solid wire for high-manganese austenite low-temperature steel and a welding process. According to the technical scheme, the laser-arc hybrid welding solid-core welding wire for the high-manganese austenite low-temperature steel comprises the following chemical components: 0.20-0.60 wt% of C; si is less than or equal to 0.05 wt%; the content of Mn is 20-32 wt%; the content of Ni is 0.1 to 2 weight percent; the content of Cr is 0.1 to 1.8 wt%; the content of Cu is 0.55 to 1.00 wt%; the content of W is 0.5 to 1.9 weight percent; the content of Mo is 1.3 to 3.0 wt%; the content of Al is 0.5 to 2 weight percent; the content of Nb + V + Ti + B + RE is 0-0.5 wt%; p < = 0.002 wt%; s < = 0.001 wt%; and the balance of Fe and inevitable impurities. The welding process is laser-arc hybrid welding. Full-automatic welding can be achieved, the welding efficiency is high, welding smoke is little, welding deformation is small, forming is good, and the mechanical property is excellent; a laser and electric arc hybrid welding process is adopted, so that the characteristics of good forming, small welding smoke dust, small welding deformation, high welding efficiency and high ultralow-temperature toughness are achieved, and the strength is matched with that of high-manganese austenite low-temperature steel.

Description

technical field [0001] The invention belongs to the technical field of solid core welding wire for laser-arc hybrid welding. Specifically relates to a high manganese austenitic low temperature steel laser-arc composite welding solid core welding wire and welding process. Background technique [0002] In recent years, with the rapid development of liquefied natural gas (abbreviated as LNG, the same below) clean energy, LNG storage and transportation equipment (its service temperature is -196°C) has shown unprecedented huge demand. At present, the steel used for commercial LNG storage tanks is 9Ni steel, which is expensive. Therefore, the development and development of new low-temperature steel has become an important direction for all countries in the world. High manganese steel with a manganese content of 22-25%, because it has the same physical and metallurgical characteristics as nickel, by adding other alloy elements, the stacking fault energy of high manganese steel can...

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Problems solved by technology

"HIGH STRENGTH WELDING JOINT HAVING EXCELLENT IMPACT TOUGHNESS AT VERY LOWTEMPERATURE,AND FLUX-CORED ARC WELDING WIRE THEREFOR" (US201816189232) patented technology and "A metal powder-cored flux-cored wire for ultra-low temperature high manganese steel gas metal arc welding" (CN201910008171 .1) Patented technology, which discloses CO used for high manganese low temperature steel 2 or CO 2 Flux-cored welding wire and solid-cored welding wire protected by +Ar mixed gas can achieve high-efficiency welding in all positions, but there are problems such as large smoke and dust, large spatter, poor weld metal formation and low mechanical properties.

[0007] At present, the main technical problems of high-manganese austenitic low-temperature steel welding materials are: low welding efficiency, large welding fumes, large welding deformation and poor weld metal formation