Process method for plugging and welding closed space

Abstract

The invention relates to the technical field of closed space plugging and welding processes, in particular to a process method for plugging and welding a closed space. The process method for pluggingand welding the closed space comprises the following steps that (1), protective gas is injected into an aluminum handrail pipe through a gas transmission pipe guide nozzle aligned with a process holeof the aluminum handrail pipe, wherein the gas flow rate is set to be 8-12 L / min; when inflating, the process hole is made to leave a gap to ensure that the gas in the aluminum handrail pipe runs out,and the gas transmission pipe guide nozzle is pulled out when waiting for 1.5-2 min; and (2), the process hole is immediately repaired by using tungsten inert gas arc welding. The process method is easy and convenient to implement; through the method of plugging and welding the closed aluminum handrail pipe after the closed aluminum handrail pipe is filled with the protective gas, the problem ofthe difficult hole repair of the process hole in the closed space is solved, the surface defect of the product is overcome, repeated hole filling is avoided, the efficiency is improved, the product quality is stable, and the production cost is reduced; and meanwhile the protective gas can be replaced according to the production demand, and the process method is suitable for various closed space structures needing to be plugged.

Description

technical field [0001] The invention relates to the technical field of closed space sealing welding technology, in particular to a closed space sealing welding process method. Background technique [0002] With the vigorous development of China's rail transit, aluminum alloy products have been more widely used due to their lightweight characteristics, and aluminum handrails have also gained more favor. If the airtight handrail does not have a process hole to vent the air, the air in the pipe will expand and escape when it is welded, and the protection of the argon gas will be washed away, making welding extremely difficult. For this reason, we adopt the method of opening a process hole on the invisible surface and filling it after welding. Although the optimized measures of refilling holes after complete cooling after welding, opening small holes, and countersinking are adopted, due to the characteristic that the gas in the handrail pipe will escape, it is still very diffic...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, to provide a closed space sealing welding process, which can solve the difficult problem of welding of closed aluminum handrails, the product surface after welding has no pores, and the product quality is improved; Replenish holes repeatedly, improve production efficiency, stabilize product quality, and reduce production costs. The method of filling argon gas into the confined space is adopted, and the type of protective gas and the method of filling protective gas can be changed according to the actual situation.