Method and device for back-up shielding, of a region to be welded, by means of a gas.

摘要

The back-up shielding gas is continuously supplied to the diffuser 7 under a slight predetermined overpressure imposed by a pressure microregulator 14. Thus, when the welded joint closes on itself, the flow of gas automatically decreases until being cut off at the end of welding. Application to the welding of closed vessels and pipework. <IMAGE>