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在硬度ＨＲＣ５５冷焊钢焊缝中，利用Ｎｂ，Ｔｉ，Ｖ，Ｚｒ，Ｒｅ进行复合变质处理，以期改善焊态抗裂性．经光镜、电镜、Ｘ－射线萤光、电子探针分析表明，细粒状、弥散化碳化物的早期大量析出，可抑制碳化物沿柱状晶界的网状析出；强碳化物形成元素的存在，能导致高碳焊缝的基体组织“贫碳”而转变为低碳板条马氏体，最终获得高硬度兼高韧性、适应冷焊工艺的钢焊缝．
In HRC55 cold-welded steel welding seam, the use of Nb, Ti, V, Zr, Re compound metamorphic treatment, in order to improve the welding crack resistance. The results of light microscopy, electron microscopy, X-ray fluorescence and electron probe analysis showed that the precipitation of fine grained and dispersed carbides could inhibit the precipitation of carbides along the columnar grain boundaries. The presence of strong carbide forming elements , Can lead to high-carbon weld matrix organization “poor carbon” and transformed into low-carbon lath martensite, and ultimately obtain high hardness and high toughness, to adapt to the cold welding of steel welding seam.