Cold wire submerged-arc welding method and device, control system and control method

Abstract

The invention relates to a cold wire submerged arc welding method and control system, using a piece of cold wire inserted in to the overheated fuse pool, stuffing the central part of the high temperature fuse pool, the cold wire driven by the wire feeding wheel, sticking out from the positioning nozzle of the zigzag hose inside the positioning sleeve which sliding along the circumference with rotary subsidiary as the axis, the positioning plate installed on the fixed sleeve, control system made of two subsystems with same single chip machines, through RXD, TXD generating synchronic pulses, by determining the inserting location, cold wire stuffing inside the high temperature fuse pool center, flaming arc welding wire forming the fuse pool, timely collected welding current, electric arc voltage, determining the fuse pool length threshold value, and starting feeding the cold wire when the length of the fuse pool bigger than that of the fuse length threshold value.

Description

technical field [0001] The invention relates to submerged arc automatic welding in arc welding, and the international patent classification is B23K9 / 18. Background technique [0002] Submerged arc automatic welding is a kind of high-energy fusion that uses molten flux to participate in the metallurgical reaction of the weld while forming an air cavity under the flux layer to isolate the air. Welding method. However, when this process method is used for welding pipeline steel, high-strength steel and other heat-sensitive medium and thick plates, the overheating caused by the large input energy to the base metal will cause damage such as softening of the heat-affected zone. [0003] The multi-wire multi-arc submerged arc welding method currently used in the industry has been used in welding some thick plate welding structures (large ship hulls, welded steel pipes, thick-walled pressure vessels, H-shaped steel beams), and as many as 3 to 6 sending machines have been used. The...

AI Technical Summary

Problems solved by technology

It is often necessary to correct the deformation problem caused by high heat input after welding, and ignore the thermal damage to the base metal

Especially when using single-wire or multi-wire submerged arc welding of fine-grained high-strength steel and a class of materials with strong heat sensitivity, large energy input into the base metal and weld will cause overheating damage to the base metal and weld, It causes the grain coarsening in the heat-affected zone of the base metal, resulting in local softening, which makes the mechanical properties of the heat-affected zone uneven, affecting the welding quality and performance

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