Pipe fitting welding tool and method capable of guaranteeing butt-joint concentricity

Abstract

The invention discloses a pipe fitting welding tool and method capable of guaranteeing butt-joint concentricity, which is used for assembly welding of an inner tube of a stainless steel dual-wall tubefor a marine low-speed diesel engine. The pipe fitting welding tool comprises a platform, a base, an upper cover, a copper lining and a copper outer lining, wherein the platform is positioned on thebottom of the whole device; the base is fixedly arranged on the upper part of the platform, and a semicircular groove is formed in the upper part; the upper cover is fixedly connected to the base through a fastening bolt, and a semicircular groove is formed in the lower part of the upper cover; the copper lining is in the shape of a semi-circular ring and is embedded into the semicircular groove of the base; the copper outer lining is the same with the copper lining in structure, and is embedded into the semicircular groove of the upper cover; and the copper lining is in butt joint with the copper outer lining for clamping an inner tube therein, so that concentricity of pipe fittings is guaranteed. Through stage-by-stage operation, deformation is corrected time by time, so that dimension precision is guaranteed, product quality is stabilized, and operation efficiency is improved, and thus, the pipe fitting welding tool can be used for welding assembly of all stainless steel pipe fittings.

Description

technical field [0001] The invention relates to a manufacturing process of a marine low-speed diesel engine, in particular to a pipe fitting welding tool and method for ensuring butt joint coaxiality, and belongs to the technical field of diesel engine manufacturing. Background technique [0002] The air pollution caused by ship emissions has attracted widespread attention from the international community, and dual-fuel engines have become an important development direction of ship engine technology. Stainless steel double-wall pipes are important components of dual-fuel main engines. Double-wall pipes for marine low-speed diesel engines are generally stainless steel thin-wall pipes. The control of dimensional accuracy is very important in the manufacturing process. Due to the low thermal conductivity of stainless steel pipes, the heat generated during the welding process can easily cause welding deformation. When making double-walled stainless steel pipes, the inner pipe is...

AI Technical Summary

Problems solved by technology

However, each welding will produce a small amount of welding deformation. After welding with multiple welds, the welding deformation will accumulate and enlarge, resulting in the bending of the central axis of the entire pipe. Therefore, the dimensional accuracy of the pipe fittings cannot be guaranteed and the installation of the main pipe will be affected.

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