Welding of zirconium
The company offers electrovec-steel in the range of zirconium and its alloys at the prices of the manufacturer. The supplier guarantees the prompt delivery of products to the address specified by the customer.
Weldability of zirconium and its alloys
Unlike some other rare metals, zirconium is easily welded using practical inert gas fusion welding methods, such as gas arc welding, plasma arc welding, as well as specialized processes such as electron beam and laser welding.
The material requires additional attention to shielding cleanliness and inert gas to protect the welding zone from foreign materials and atmospheric pollution. Cleanliness and protection are the two most important factors affecting the final quality of welding.
Of alloys, zirconium, doped 2.0 — 3.0% niobium, is the most frequently welded.
The use of this alloy is limited in pressure equipment, in particular, because of the need to remove residual welding stresses.
The American Society of Welders (AWS) recommends welding zirconium alloys using welding electrodes without coatings.
The strength of conventional zirconium is determined mainly by the amount of oxygen, nitrogen, carbon, hydrogen and iron. The more these elements are present, the higher the strength and the lower the ductility. When welding, the welding seam and welding wire must be thoroughly and completely cleaned and do not introduce foreign materials during welding processes. The surface of the weld, the root of the seam and the adjacent hot metal must also be protected with a layer of inert gas. During welding, the temperature in the area of the welding arc must be within 320… 350 0 С.
Buy zirconium and its alloys at the prices of the manufacturer offers the company Elektrovek-steel. The supplier guarantees timely delivery of products to any point specified by the customer.
Features of welding technology
The most common process used for welding with zirconium is gas arc welding. The process allows you to completely weld any configuration, to which you can bring a torch.
Automatic welding is usually limited to flat or horizontal positions of welded products. Welding machines with copper support rods are common for making direct connections. For single use
Use plasma-arc welding using automated equipment. As a rule, after welding to correct the unfilled, an additional pass may be required along the sides of the root of the seam.
These methods of welding zirconium are usually carried out by means of a current source connected to the burner. The parameters of the process control are frequency arc starting, manual current control and contactor for creating and destroying the arc.
The filler metal must be stored in a dry, tightly closed cabinet. Pipes for wire feeding should be clean, and, if possible, used only for welding zirconium and its alloys. Before welding, the products must be thoroughly cleaned of impurities.
Immediately before welding, the surface of the welded seam is to be crushed, and then wiped with a lint-free cloth moistened with acetone or a similar non-chlorinated solvent.
Zirconium is much easier to weld in an inert gas environment (argon, helium or a mixture of these).
Zirconium also requires the protection of the inert gas of the solidified weld and the adjacent metal surfaces heated during welding to prevent surface oxidation and consequent consequent destruction.
Argon, containing not more than 0.002% impurities, provides excellent arc stability, and because it is heavier than air, it covers the weld and provides protection.
For welding, clean transparent plastic gas hoses (PVC, vinyl, Teflon, polypropylene or high-density polyethylene) are used to eliminate the air permeability that occurs when using rubber.
It is recommended to maintain a continuous stream of argon to remove any material coming from the surface of zirconium, using welding heat and providing a constant, small positive pressure. Argon is a poor conductor of heat, so welded parts can become quite hot and can slightly discolor, as zirconium adsorbs oxygen left in the atmosphere of argon.
Buy zirconium and its alloys at the prices of the manufacturer offers the company Elektrovek-steel. The supplier guarantees immediate delivery of the products to any point specified by the customer.