Tips For Welding Special Metals
Titanium alloy welding tips
Welding method: Commonly used welding methods for titanium alloys include tungsten inert gas shielded welding (GTAW/TIG), plasma arc welding (PAW), and laser welding. Tungsten inert gas shielded welding uses argon as the shielding gas, which is simple to operate and has good welding quality, but low efficiency; plasma arc welding has strong penetration and is suitable for medium and thick plate welding; laser welding is suitable for thin-walled materials, with high welding efficiency and small deformation.
Pre-welding preparation: Thoroughly clean the welding area to remove oxide film, grease, water, dust and other debris. Select the right welding material and shielding gas to ensure that the gas purity meets the requirements. Debug and inspect the welding equipment to ensure normal operation.
Welding operation: Select the right process parameters according to the welding method and material thickness. Keep the angle between the welding wire and the weldment small and the wire feeding stable. Avoid striking or testing arcs on the surface of welds to ensure the quality of arc starting and arc ending. The weld should be welded continuously at one time. If interrupted, it needs to be inspected and welding can be continued only after confirming that there are no cracks.
Gas protection: During welding, the molten pool and weld should be fully protected by gas to prevent oxidation. The flow and pressure of the shielding gas should meet the requirements to ensure that the welding area is not contaminated by harmful gases.
Post-weld inspection: Check the appearance of the weld to ensure that there are no defects such as cracks, unfused, pores, and weld nodules. Perform non-destructive testing, such as penetration testing and radiographic testing, to ensure the quality of the weld.
Aluminum alloy welding skills
Tungsten inert gas welding: Suitable for welding aluminum alloys, especially for thin plate materials and chemically active non-ferrous metals such as aluminum, magnesium and alloys. The advantages of this method include stable arc, beautiful weld formation, no spatter, etc.
Resistance spot welding and seam welding: Suitable for aluminum alloy thin plates and suitable for mass production. Requires a higher welding current and is suitable for efficient production.
Pulse argon arc welding: It has excellent stability and is suitable for thin plates, all-position welding and materials that are highly sensitive to heat. The advantages of this method include small deformation of welded parts and small heat-affected zone.
Pre-welding preparation: Thoroughly clean the surface of the aluminum alloy to ensure that there are no impurities such as oil, dust, etc. For thick plate aluminum alloys, it is recommended to preheat first to avoid poor welding.
Welding operation: Select appropriate welding parameters and current, keep the cable length moderate, and ensure stable wire feeding.
Gas protection: Ensure the purity of argon gas to prevent air from mixing into the weld and contaminating the weld.
