welding-alloys.com 33 Nickel based alloys Nickel based alloys are widely used for joining, cladding, and repair operations due to their exceptional performance. They provide an ideal solution for corrosion resistance, high strength at both ambient and extreme temperatures, as well as ductility and toughness at low temperatures. Additionally, these alloys share a similar distortion tendency with carbon-manganese steels, due to their comparable thermal expansion characteristics. In terms of operability, nickel based alloys offer two main advantages: • Ease of use - these alloys require welding procedures similar to stainless steels, usually eliminating the need for preheating before welding. However, depending on the type of base metal and thickness, preheating, post- heating, and even PWHT (Post Weld Heat Treatment) may be necessary to prevent a brittle heat-affected zone, for example, during cladding operations on 1.25% Cr-0.5% Mo. • Versatility - they can be used for both homogeneous and heterogeneous welding, with the ability to be diluted on different parent metals while maintaining high mechanical properties. Our GAMMA 182 wire is a particularly versatile solution as it can also be used for both gas shielded and self shielded arc welding. To achieve a high deposition rate, a common practice is to weld with a high heat input (current and voltage), leading to a high puddle temperature and increased risk of hot cracking. However, when using flux cored wires with a basic slag (our GAMMA range), there are significant advantages compared to using those with a rutile slag (our GAMMA V range), thanks to deoxidising elements that drastically reduce this risk. For out of position welding jobs, the use of our GAMMA V range of products is necessary, whereas when working in the flat position, our GAMMA range of products are the ideal choice. Product GAMMA GAMMA V CAST CAST Welding process FCAW-G FCAW-G GMAW FCAW-S Wire type Flux cored Flux cored Metal cored Flux cored Slag Basic slag Fast freezing rutile slag No slag Basic slag Shielding gas M21: Ar + 15 - 25% CO2 M21: Ar + 15 - 25% CO2 M21: Ar + 15 - 25% CO2 No gas Welding positions * *Out of position welding also possible using short circuit or pulsed arc modes of transfer Back to contents page
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