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热喷焊主要用于承受热应力、冲击、严重腐蚀和磨损零部件的修复和保护。冷喷焊主要用于承受摩擦磨损和高温氧化的零件的修复和保护。一、热喷焊的应用 1.焊修铸铁裂纹采用热喷焊的一步流程法焊修铸铁裂纹很可靠。Ni-Cr-B-Si合金的抗拉强度可达20～30公斤/毫米~2,虽然延伸率较低.但对焊接铸铁是足够的。由于加热均匀和冷却缓慢,以及对基体热输入小和基体不熔化,所以不会在基本金属内析出粗片状石墨和形成硬相,不会降低接头的结合强度,接头的可加工性良好。
Thermal spray welding is mainly used to withstand thermal stress, impact, severe corrosion and wear parts repair and protection. Cold spray welding is mainly used to withstand friction wear and high temperature oxidation of parts repair and protection. First, the application of thermal spray welding 1. Welding repair cast iron cracks using thermal spray welding step cast iron repair process is very reliable. Ni-Cr-B-Si alloy tensile strength up to 20 ~ 30 kg / mm ~ 2, although the elongation is low, but the welding cast iron is sufficient. Due to the uniform heating and slow cooling, small heat input to the substrate and no melting of the matrix, coarse flaky graphite and hard phases are not precipitated in the base metal, the joint strength of the joint is not reduced, and the processability of the joint is good.