Welding requirements and precautions for titanium alloy conduits

(1) Try to set up a dedicated welding workshop, indoor smoking is strictly prohibited, the environment is clean and dry, and the convection of air is strictly controlled.

(2) Welders wear clean work clothes when welding, wear degreasing gloves, and do not touch parts with bare hands.

(3) The welding area and the surface of the welding wire should be degreased with acetone.

(4) Adopt high purity protection argon, purity is not less than 99.99%. The gas supply flow during welding should be protected against the front and back of the weld bead according to the value specified in the process specification.

(5) During the welding process, the flow rate of argon gas in the tube and the nozzle of the welding tool should be kept constant to prevent the formation of the weld pool in the tube from convex and concave.

(6) When welding, short arc welding should be used as far as possible, and small welding line energy should be used.

(7) When spot-welding the nozzle, the gap is less than 30% of the wall thickness. Each weld should be completed as soon as possible.

(8) When welding, the welding tool should not swing from side to side, and the melting end of the welding wire should not be moved out of the gas protection zone. The arc should be pumped 10-15s in advance, and the welding torch cannot be lifted immediately when the arc is breathing, and the gas supply should be delayed 15-30s until the temperature drops below 250℃.