Biphase steel SA-240 S31803 handwork tungsten electrode argon arc GTAW welding process

Abstract

The invention relates to a manual dual phase steel SA-240 S31803 gas tungsten arc welding (GTAW) technology which is characterized by comprising the following steps: a 30 degree plus 5 degree divided edge is formed on a welding surface by a mechanical method, water, oil stain, iron rust and welding wires on the surface and both sides of the divided edge are gotten rid of, a contravariant AC tungsten electrode argon arc welding machine is used as a welder, (Ar plus (1 to 2 percent) N 2) mixed gas is the protective gas in a welding torch, pure argon is used as back protective gas, the diameter of the selected solid ER2209 welding wire is 2.4mm, the diameter of the welding nozzle of the contravariant AC tungsten electrode argon arc welding machine is 12 mm, the diameter of a tungsten bar is 2.4mm, and the purity quotient of argon is 99.995 percent. The welding technology includes the bottoming of the bottom of the divided edge and the welding of the surface of an upper filling cover, the welding operation is the straight channel welding, and the welding of the surface of the upper filling cover comprises the welding of left and right crossed straight channels. The heat input ranges from 0.5 to 2.5 KJ / mm during welding, the interlayer-temperature does not exceed 150 DEG C, and the thickness of each layer welding seam does not exceed 2.5mm. The welding technology has the advantages that the content of ferrolites in each welding seam can be guaranteed to range from 35 to 60 percent, and the resistance to corrosion and chemical components of the dual phase steel can not be destroyed.

Description

technical field [0001] The invention relates to a welding process of dual-phase steel, in particular to a manual tungsten argon arc GTAW welding process of dual-phase steel SA-240 S31803. Background technique [0002] Austenitic-ferritic stainless steel is generally called duplex steel. It has a high content of chromium and a certain amount of nickel and molybdenum. It has good resistance to chloride stress corrosion, pitting corrosion and crevice corrosion. Dual-phase steel also has high tensile strength and wear resistance. Therefore, dual-phase steel is widely used in containers and structural parts of highly corrosive media, chemical solvent storage tanks, offshore container equipment, and marine chemical transportation Boat. Due to the relatively small application of dual-phase steel in China, the use and procurement of dual-phase steel is relatively difficult. Therefore, the welding process of dual-phase steel is in its infancy, and there is no mature process to guide...

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Problems solved by technology

Due to the relatively small application of dual-phase steel in China, the use and procurement of dual-phase steel is relatively difficult. Therefore, the welding process of dual-phase steel is in its infancy, and there is no mature process to guide production, which makes the production of dual-phase steel products encounter difficulties. , product quality is difficult to guarantee, so it is urgent to develop a new process suitable for dual-phase steel welding

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