Argon arc welding back shielding gas device for vertical welding seam

Abstract

An argon arc welding back shielding gas device for a vertical welding seam comprises a guide rod and a clamping structure connected with the guide rod. A flexible sealing strip is fixed to the guide rod, and a connection head is installed on the bottom of the guide rod. The clamping structure comprises a pressing rod, a connection rod connected to the pressing rod in a pivoted mode and a torsion spring installed between the connection rod and the pressing rod. The pressing rod is connected with a handle in a pivoted mode. The connection rod comprises a base and a rectangular block arranged on the base. A square groove for an insertion piece to be inserted is formed in the side surface of the rectangular block, and a stud locking the insertion piece is arranged on the side surface of the rectangular block. The rectangular block is provided with an auxiliary handle, a supporting arm of the auxiliary handle is installed on the rectangular block, and the other supporting arm of the auxiliary handle is installed on the handle in a suspension mode and is clamped to or loosened from the handle to control lifting and pressing of the pressing rod. According to the argon arc welding back shielding gas device, one side welding and double side forming can be achieved, the polishing and sealing process on the back side can be eliminated, the welding efficiency of semi-automatic argon arc welding is improved, the labor intensity of operating personnel is lowered, and the engineering cost is lowered.

Description

technical field [0001] The invention relates to a welding auxiliary device, in particular to an argon arc welding back shielding gas device for providing shielding gas for vertical seam welding. It belongs to the field of welding. Background technique [0002] Low-temperature steel welding is one of the key technologies in the construction of liquefied natural gas storage tank projects. Commonly used low-temperature steel for liquefied natural gas storage tanks includes: 9% nickel steel for inner tanks of liquefied natural gas storage tanks, TP304 / 304L for cryogenic pipelines Stainless steel. Among them, the vertical seam welding of 9% nickel steel mainly adopts the traditional manual arc welding or argon arc welding process. And manual argon arc welding is known for its good weld shape and excellent welding quality. However, its biggest disadvantage is that the labor intensity of the operator is relatively high and the welding efficiency is low. In order to improve weld...

AI Technical Summary

Problems solved by technology

However, in view of the technical characteristics of argon arc welding itself, in the vertical seam welding of the tank body, the rear side of the weld seam is seriously oxidized because no back shielding gas is applied; Meet the welding quality requirements, which affects the welding efficiency of semi-automatic argon arc welding to a certain extent

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