In view of the high cost of existing automation equipment and the incompatibility of simple welding machines with flat

straight-walled

and expanded port forms in the multi-specification small-batch precision metal bellows seam welding in special fields

this paper develops a low-cost multifunctional seam welding machine. The equipment

with a rotating position-changing device at its core

realizes 90° quick switching between horizontal and vertical positions through the cooperation of a 1/4 arc slot hole and a locking rod

adapting to different port form welding needs; DC motor + gear drive replaces the servo drive system

reducing costs while increasing control accuracy by narrowing the speed adjustment range through the gear mechanism; equipped with an X-Y adjustable welding torch holder and a sliding platform - top combination positioning system to ensure 0.3-0.5 mm level pairing accuracy

avoiding delamination defects in thin-walled multilayer structure welding. Test verification shows that the welded components meet the JB/T 11620 standard requirements through fluorescent penetrant

helium mass spectrometry leak rate

and metallographic tests; the equipment has good stability after continuous operation for 5 years

and the comprehensive cost is reduced by more than 40% compared to similar automation equipment. This research

through the integrated design of "adjustable position + low-cost drive + precise positioning

" breaks through the bottleneck that traditional welding machines are difficult to balance universality and economy

providing an efficient solution for small-batch multi-specification bellows welding. Its structural innovation has reference value for the research and development of similar non-standard welding equipment.