All-position automatic welding technology applied to pipeline joint of vehicle liquefied natural gas cylinder

Abstract

The invention comprises an all-position automatic welding technology applied to a pipeline joint of a vehicle liquefied natural gas cylinder. The joint is assembled in a fixture a; a pipeline is assembled in a fixture b; a tungsten electrode is installed on a gear; the pipeline and a pipeline butt weld seam tungsten electrode are centered at a center of a welding seam, and the pipeline and a jointinsertion weld seam tungsten electrode are centered at an end face of the joint; height of the tungsten electrode is adjusted to a proper value; according to wall thicknesses of the pipeline and thejoint, a rotation angle of the tungsten electrode is set on a welding power source, and the rotation angle is within 375 degrees and 385 degrees; welding parameters are set in four intervals; back face protection gas is fed from an end face of the joint or the pipeline; the welding power source is powered on; the tungsten electrode is rotated along a welding object at a preset angle and then rotation is stopped; electric arc is extinguished; a welding course is completed; and the joint or the pipeline is removed from the fixture. The technology provided by the invention have the beneficial effects that a manual tungsten electrode argon arc welding course with difficult operations is not needed; the all-position automatic welding technology is realized through fixation of the pipeline and the joint without filling of a filling wire; pulse welding heat input is small; quality and consistency of welding seams are high; and low requirements are proposed for workers' skills.

Description

technical field [0001] The invention relates to the field of liquefied natural gas cylinders for vehicles, in particular to an all-position automatic welding technology for pipeline joints of liquefied natural gas cylinders for vehicles. Background technique [0002] The butt welds or fillet welds formed by the internal pipelines and joints of the LNG cylinders for vehicles, and the external pipelines and joints of the assembly are all welded by manual argon tungsten arc welding, and the austenite is welded by manual argon tungsten arc welding. For stainless steel, in order to ensure the welding quality, it is necessary to pass argon gas into the back of the weld for protection. In order to make the welding position as flat as possible during the welding process, the pipe joint needs to be continuously rotated; the butt weld between the pipe and the pipe needs to be filled with wire The welding operation is difficult; the wall thickness of the fillet weld between the pipelin...

AI Technical Summary

Problems solved by technology

Therefore, the welding efficiency is low, the welding quality is difficult to guarantee, and the welder's skills are high.

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