Analysis of TIG welding process of aluminized steel

Aluminized steel refers to a new type of composite steel material in which 0.10-0.5 mm of aluminum is infiltrated into the steel surface to form an iron-aluminum alloy layer. Aluminized steel has excellent resistance to high temperature oxidation and corrosion resistance and is therefore widely used in petroleum, chemical and aerospace industries.

According to Xingke Hardware Network, ordinary arc welding is applied to the welding problems of the aluminized steel pipe and the flange plate (the steel pipe is a low-alloy Cr5Mo aluminized steel and the flange plate is 45 steel is anodized). Near seam area is prone to cracks and the corrosion resistance of the fusion zone is reduced. After repeated trials, satisfactory welding results have been achieved with the TIG welding process.

TIG welding process: surface degreasing → rinsing → surface detachment → coating the welding coating → assembly and spot solidification → welding bottom layer → welding cover surface → post weld heat preservation → post weld inspection.

According to the welding joint strength test standard test, measured σb = 559MPa, bending test (180 °) no cracks, indicating that the joint strength and plastic compliance requirements. Inspection of welding defects using ultrasonic testing, weld cracks, the number of stomatal standards. Corrosion resistance test: In the salt spray test chamber, 180°C for 120 hours, the corrosion resistance is good.

Experiments show that when welding aluminized steel, the use of TIG welding process, use of austenitic steel as filler wire and a reasonable welding process, the welding joint has good mechanical properties and corrosion resistance, fully meet the welding quality requirements.