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采用电子探针的波谱分析方法，对国产低锡Ｚｒ４包壳管的环焊缝试样进行表面成份分析。分析结果表明，从焊缝的外边缘到内边缘，Ｓｎ、Ｃｒ、Ｆｅ元素的化学成份在统计上呈增大趋势，腐蚀后出现了白色产物的试样表层，其Ｓｎ、Ｃｒ、Ｆｅ元素含量相当程度地降低。这一事实表明，国产低锡Ｚｒ４包壳管采用电子束焊接时，在一定的焊接规范下环焊缝的合金元素存在严重蒸发现象，特别是合金中锡元素的蒸发使其锡元素含量低于０．５％，导致了腐蚀性能的下降。
By using the electronic probe spectroscopy method, the surface composition of the girth weld of the domestic low-tin Zr4 cladding tube was analyzed. The results show that the chemical composition of Sn, Cr and Fe elements increases from the outer edge to the inner edge of the weld seam, and the surface layer of white product appears after corrosion. The contents of Sn, Cr and Fe To a considerable extent reduced. This fact shows that when the domestic low-tin Zr 4 cladding tube electron beam welding, under certain welding specifications, the alloying elements of the girth weld have serious evaporation phenomenon, especially the evaporation of the tin element in the alloy makes its tin content Below 0.5% results in a decrease of corrosion performance.