Titanium has strong chemical activity. As the temperature increases, its chemical activity will increase rapidly and can strongly absorb various gases in the solid state. Common welding methods for titanium alloys include: tungsten argon arc welding, plasma arc welding, electron beam welding, laser welding, linear friction welding, etc.
Tungsten argon arc welding is the most commonly used welding method in titanium and titanium alloys. It will protect the gas state in the heat-affected zone of electrode rods, molten pools, arcs and welds, thereby isolating the infiltration of the atmosphere, avoiding contamination on the welds, and improving the welding quality. Tungsten electrode argon arc welding is relatively common in connecting thin plates and base welding, and is mainly used in plate welding below 10mm. This welding method uses a high melting point tungsten rod as an electrode to melt the welding wire or metal between the tungsten rod and the weldment to achieve the purpose of welding. Generally speaking, tungsten electrode argon arc welding is available in two types: automatic welding and manual welding. The fracture morphology of the welded joint is shown in Figure 1. Plasma arc welding is also very common in titanium and titanium alloy welding. It also uses argon protection. Plasma arc welding uses a heat transfer plasma generated by a constant current power supply. When using plasma arc welding, in order to avoid the production of titanium hydride, 5% to 7% hydrogen is generally added to the argon gas. Using pure argon gas without hydrogen or a mixture of argon and helium can improve the shrinkage of the arc. However, the welding range of plasma arc welding is relatively narrow and the welding repeatability is poor. The vacuum electron beam welding process operates in a vacuum, so air pollution is completely avoided and the welding quality of the weld is relatively high. The energy beam focal of electron beam welding is small and the heat is relatively concentrated, so the weld of electron beam welding is narrower and the heat-affected zone is small. However, the disadvantage of using vacuum electron beam welding is that the space is limited, so the size of the welded parts will be limited to certain limits and large-scale production cannot be carried out.
Shaanxi Hangyu Nonferrous Metal Processing Co., Ltd. was established in December 2005. It is a high-tech enterprise mainly forging and deep processing of precision parts such as titanium and titanium alloys, nickel, zirconium and other non-ferrous metal materials. Its product scope covers aerospace, weapons, marine equipment and petrochemical fields. The company has delivered titanium alloy welding structural parts such as TC4 titanium alloy frames, skeletons and pressure-resistant cylinders in bulk for the marine equipment field, and has the ability to deep processing of titanium and titanium alloy raw materials to precision parts machine addition and welding. It can provide you with the best titanium alloy structural parts welding solutions.
