Welding wires with higher purity than the base metal should be used. Before use, the welding wire needs to undergo a material re inspection. If the weldment requires high plasticity. Check the factory certificate of conformity and quality certificate; The surface of the welding wire should be clean and free from defects such as oxidation color, cracks, peeling, scars, and slag inclusions. Titanium plate and titanium tube have special physical and chemical properties, so their welding process is very different from other metals. Titanium welding is a TiG welding process that effectively protects the welding area using inert argon gas. Before using argon gas, the factory certificate on the bottle body is checked to verify the purity index of the argon gas, and then the bottle valve is checked for any leakage or malfunction.
When welding titanium plates and rods, it is necessary to ensure that:
The metal in the welding area is not contaminated by the active gas N0H and harmful impurity elements CFeMn above 250 ℃. The purity shall not be less than 99.98%, and the water content shall be less than 50Mg/m32. Argon: industrial grade pure argon. Unable to form coarse grain structure. The welding process must follow the predetermined construction sequence and must not generate significant welding residual stress and deformation. So. Strictly follow the process quality management standards and implement quality control throughout the entire process, ensuring that all factors such as personnel, machinery, materials, and methods are in a good controlled state, thereby ensuring the welding quality of titanium pipes within a reasonable construction period.
Titanium welding equipment and materials:
Equipped with a complete ammeter and voltmeter.
Welding machine: DC TiG welding machine is used. The welding machine should ensure excellent working and adjustment characteristics, lightweight and durable.
Welding torch: QS-75 °/500 water-cooled TiG welding torch is used. The welding torch should have a simple structure. The gun body is tight, with good insulation, stable airflow, and a firm tungsten holder, suitable for welding in various positions. Rubber hoses and other moisture absorbing materials should not be used. When using, it should be dedicated, with an argon gas delivery pipe; Using semi rigid plastic pipes. Do not use in series with pipes transporting other gases. The argon gas pipe should not be too long to avoid unstable airflow caused by excessive pressure drop. Generally, it should not exceed 30m to ensure consistency of the axis. Welding fixtures: use austenitic stainless steel or copper pipe clamps, locking bolts, etc. to assemble titanium plates and accessories. It should be ensured that there is a certain clamping force on the titanium plate and accessories. The gap is uniform and appropriate. Polishing machine, auxiliary equipment and tools: argon protective cover. Special file, stainless steel wire brush, etc.
Titanium welding wire: The welding wire brand is ERTi2, and the selection of welding wire should meet the following requirements: the chemical composition and mechanical properties of the welding wire should be equivalent to the base material
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