哈氏合金B-3等离子弧焊接及盐酸法（加压）晶间腐蚀试验

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Hastelloy B-3 is a nickel-molybdenum alloy with excellent resistance to strong reducing condition.Similar as most austenitic structural material,it is sensitive to intergranulal corrosion as stability is poor at medium temperature.So it is very critical for the welding quality by strictly controlled energy input and interlayer temperature during welding.The correct welding procedure was found out and established based on Hastelloy B-3 property and welding features and intergranular corrosion test with hydrochloride method（with pressure） on plasma arc welded test samples.哈氏合金B-3是一种抗强还原性介质腐蚀的镍钼合金,与大多数奥氏体材料类似,由于中温热稳定性较差而易引起晶间腐蚀敏感,严格控制线能量及层间温度是保证其焊接质量的关键。根据哈氏合金B-3材料性能及焊接特性,采用等离子弧焊接试板并选择盐酸法（加压）对试样进行晶间腐蚀试验,以达到摸索并制定正确的焊接工艺的目的。