Since titanium has very good fluidity after melting, which is higher than other metals except silver, when welding in all positions, it is recommended to strike the arc at one o'clock and weld counterclockwise to 11 o'clock using high-frequency arc extinguishing to increase the extinguishing rate. The arc frequency prevents the droplets from flowing too fast, which affects the welding quality of the titanium pipe and the appearance of the weld, and avoids uneven thickness of the weld. When the arc is extinguished, it should be 4~6mm past the arc striking point, and the arc should be extinguished on the copper rod to avoid arc craters.
In summary, in titanium pipe welding, it is effective to choose a large-nozzle water-cooled welding gun and use the characteristics of pure copper rods to absorb heat quickly to accelerate the cooling rate of the weld. The process measures and operating methods adopted ensured the overall welding quality of the heat exchanger, achieved good results, and achieved significant economic benefits.
