P + T welding method for stainless steel thin-wall container

The invention relates to a P + T welding method for a stainless steel thin-wall container. The technical problems that in the P + T welding process parameters of an existing thin-wall container, Ar is adopted as plasma gas, plasma shielding gas, argon tungsten-arc welding shielding gas, supporting cover gas and back shielding gas, the welding speed is low, the production efficiency is low, and the cost is high are solved. Welding parameters adopted by the P + T welding method are as follows: plasma gas is mixed gas of Ar and H2, the H2 accounts for 1%-7% of the total percentage, and the flow of the plasma gas is 5-6 L/min; the plasma current ranges from 220 A to 300 A, and the plasma voltage ranges from 30 V to 34 V; the plasma shielding gas is Ar; the plasma and argon tungsten-arc welding supporting cover gas is Ar, and the gas flow of the plasma and argon tungsten-arc welding supporting cover gas is 15-25 L/min; the back shielding gas is Ar; the argon tungsten-arc welding protective gas is mixed gas of Ar a