Conductive device used for narrow-clearance submerged arc welding

Abstract

The invention relates to a conductive device used for narrow-clearance submerged arc welding, which is characterized by comprising a guide post, a sleeve pipe, a bracket and a conductive nozzle, wherein the guide post is used for connecting a submerged arc welding machine, a welding wire penetrates into and passes through the sleeve pipe, the conductive nozzle is arranged at the lower end of the bracket, the sleeve pipe and the conductive nozzle are mutually connected electrically, and the sleeve pipe, the conductive nozzle and the bracket are provided with insulated external wrapping layers with high temperature resistance. The conductive device for narrow-clearance submerged arc welding is connected on a machine head of a common submerged arc welding machine, so that the welding wire can extend into a deep and narrow V-shaped slope for carrying out welding operation; thus, the narrow-clearance submerged arc welding operation can be realized on the common submerged arc welding machine, a great deal of funds for purchasing a special submerged arc welding machine are saved, and the welding efficiency is high.

Description

Technical field [0001] The invention relates to equipment for welding thick-walled pressure vessels, in particular to a conductive device for narrow gap submerged arc welding. Background technique [0002] When the wall thickness of the pressure vessel exceeds 80mm, the welding seam usually adopts such as figure 1 The double "V"-shaped groove form facing the opposite side is shown. The welding seam of this form needs to be welded on the outside and inside of the container respectively, which has low work efficiency and high welding seam stress. Therefore, the welds of thick-walled pressure vessels are usually designed as figure 2 The deep and narrow single "V" bevel form shown, this single "V" bevel form is compared with the traditional double "V" bevel form, which can greatly reduce the welding workload, save costs, improve the progress, and also Can reduce the residual stress of welding. However, the weld with the single "V" structure requires a special narrow gap submerged a...

AI Technical Summary

Problems solved by technology

However, the weld of the single "V" structure requires a special narrow gap submerged arc welding machine

The minimum cost of purchasing a complete set of narrow-gap submerged arc welding machines is 700,000 to 800,000 yuan. Moreover, one or two such welding machines cannot meet the requirements. If you buy too many, the equipment will be idle and the investment will be huge

Moreover, its operation is complicated, its use is inflexible, and its maintenance and repair costs are high. Especially for imported equipment, the supply cycle of accessories is long, and it often cannot meet the progress requirements. Once the equipment fails, it is easy to delay work

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