Welding of high-temperature nickel alloys
Are you interested in welding high-temperature nickel alloys from the supplier AvecGlob? Here you will find interesting information on this topic.
General characteristics of high-temperature nickel alloys
Heat-resistant nickel alloys are able to successfully withstand the combined effects of heat and active oxidizing media. Such alloys find wide application for the equipment of chemical enterprises, which are engaged in the processing of working media at elevated temperatures and pressures.
Typical nickel alloys. Which are used for this purpose are stainless nickel-containing steels of austenitic class.
Welding methods
Most of the high-temperature nickel alloys can be welded using TIG or MIG technology. Electric welding with alternating current is also often used. Gas welding with a jet of acetylene is used much less often, and only for those alloys that are capable of forming solid solutions during melting. Solid solutions of alloys are usually welded in the annealed state and alloys with solid precipitation under conditions permitted by the solution. Preheating is not required if there is no risk of porosity from condensation of moisture. It is recommended that the material in which residual stresses are present passes through the softening heat treatment by annealing.
To restore corrosion resistance, heat treatment after welding is usually not required, but to minimize the risk of stress corrosion cracking of parts under mechanical stress, it is performed for parts of increased responsibility.
Supplier — AvekGlob company — offers at a reasonable price from the manufacturer a wide range of welded structures made of nickel-based heat-resistant alloys. The supplier guarantees the timely delivery of products to any address specified by the consumer.
Recommendations for welding of high-temperature nickel alloys
For manual and machine welding, reverse polarity of direct current is used. As a protective gas for welding nickel alloys, argon, helium, or a mixture of these gases is used. The presence of oxygen, carbon dioxide or nitrogen usually causes porosity or erosion of the electrode. This can be avoided if argon is used with small amounts of hydrogen (usually up to 5%); while the amount of oxides formed on the surface is also reduced.
Features of welding technology
Any part of the structure made of a high-temperature nickel alloy and subjected to bending, drawing or other molding operations, must be annealed before welding. Heating should be carried out in a furnace with a controlled atmosphere;
The heat balance during welding should be kept as low as possible to avoid thermal deformation of the thin joints. For multilayered welds, a lot of narrow edges should be used, rather than a few large and thick ones;
After the end of welding of high-temperature nickel alloys, it is necessary to remove residual stresses using post-operative annealing.
Supplier — AvekGlob company — offers to purchase various welded constructions made of heat-resistant nickel alloys. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.