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美国Solar Atmospheres公司用8钨棒经真空扩散焊合成一根重约1360kg，规格为127mm×609mm×914mm的粉末冶金大钨坯条。经超声波试验表明，钨合金棒完全焊合，其整体形状基本上呈塔形。甚至用显微镜放大观察也未能发现焊口(处)有任何结构改变。由于炉膛有1482℃以上高温并且加热
US Solar Atmospheres company with 8 tungsten rods by vacuum diffusion welding a weight of about 1360kg, size 127mm × 609mm × 914mm powder metallurgy big tungsten billet. The ultrasonic test showed that the tungsten alloy rod completely welded, the overall shape of the tower was basically. Even magnified microscopy did not reveal any structural changes in the weld bead. As the furnace has a high temperature above 1482 ℃ and heating