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Introduction of the welding method of titanium and titanium alloy

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Titanium alloy is particularly sensitive to oxygen at high temperature and can not contact the oxygen-containing atmosphere. Therefore, the welding of electrode arc welding and carbon dioxide gas protection welding commonly used in steel structure welding can not be used for titanium and titanium alloy welding. Buried arc welding is also rarely used in titanium alloy welding due to its large thermal inpu

The main method

The common welding methods of titanium and titanium alloy mainly include tungsten electrode inert gas protection welding, melting electrode gas protection arc welding, plasma arc welding, friction welding, vacuum diffusion welding, explosion welding, vacuum electron beam welding, laser welding.

1.Tungsten pole inert gas protection arc welding.

Tungsten polar inert gas protection welding due to simple operation, good accessibility, good welding quality, no splash, can be full position welding, low input, is the most widely used in titanium alloy welding, the disadvantage is low welding efficiency.

2.plasma arc welding

Plasma arc welding is essentially the same as argon arc welding, It belongs to the non-melting electrode gas protective welding, Unlike the free arc of tungsten-noble gas protection welding, The arc of plasma arc welding is a plasma arc obtained through mechanical compression, thermal compression and electromagnetic compression, Great support, Strong penetration force, Can not groove opening joint welding through more than 10mm, Mainly used for automatic welding of type I groove, Large thick plate can also be blunt edge bottom welded by opening the Y-shaped groove, Compared with tungsten polar inert gas protection welding, Welding efficiency is greatly improved, But most commonly used in regular long welds, Such as plate joint or cylinder vertical ring joint and other flat welding or vertical welding position of automatic welding.

3.Laser welding and vacuum electron beam welding

Laser welding and vacuum electron beam welding belong to high-energy beam welding, weld depth width ratio, especially electron beam welding, depth width ratio can reach more than 20:1. Electron beam welding can achieve small energy precision welding, but it is mainly used for the welding of large and thick parts. Because it is a vacuum environment, the titanium alloy weld oxidation and stoma possibility are fundamentally avoided. Laser welding is more used for the welding of thin-walled materials. Both welding methods can obtain high quality welds, high welding efficiency, welding deformation is very small, the disadvantage of equipment investment is large.

4.friction welding

Friction welding belongs to solid phase welding, including rotary friction welding, linear friction welding, mixing friction welding, etc., which is widely used in specific structural parts, especially in the field of aerospace precision parts.

5.vacuum diffusion welding

Vacuum diffusion welding also belongs to solid phase welding, in the field of titanium alloy, is mainly used to make composite plate, such as titanium steel composite plate, titanium aluminum composite plate, etc., in the ship field and chemical field is more common, can achieve the two bad direct phase welding components to connect the intermediate structure.

6.gas metal-arc welding

Melting pole gas protection welding is widely used in steel structure welding, the welding method is automatic welding wire as melting electrode, belongs to the category of semi-automatic welding, operation is relatively simple, collocation robot can realize automatic welding, accessibility is good, in addition to elevation welding position almost all welding, when using short circuit transition short arc welding even can also realize elevation welding position welding. Compared with tungsten extremely inert gas protection welding, its welding efficiency is much higher, and even can reach more than 10 times, the unit weld heat input is low, the welding deformation is small, so in the welding amount of large occasions, is usually preferred. However, in the field of titanium and titanium alloy, melting its gas protection welding is not very common.