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2. 发明授权

US5272305A Girth-welding process for a pipe and a high cellulose type coated electrode 失效
标题翻译：管和高纤维素涂层电极的环形焊接工艺
公开(公告)号：US5272305A
公开(公告)日：1993-12-21
申请号：US938444
申请日：1992-08-28
申请人： Shigeru Endo , Moriyasu Nagae , Motokiyo Itoh , Takeshi Sugino , Shouzou Naruse
发明人： Shigeru Endo , Moriyasu Nagae , Motokiyo Itoh , Takeshi Sugino , Shouzou Naruse
IPC分类号： B23K35/30 , B23K35/365 , B23K35/22
CPC分类号： B23K35/3053 , B23K35/365
摘要： Chemical compositions of a base metal and a high cellulose type welding electrode are regulated within predetermined ranges, so that the chemical composition of the weld metal obtained from the welding can be regulated within a predetermined range. Particularly, with respect to the weld metal, the Mo content (Mo)1 in the weld metal and the Mo content (Mo)2 in the base metal are regulated such that the difference between the both contents .DELTA.Mo (=(Mo)1-(Mo)2) is 0.03% or more, and PCM is 0.30% or less, where PCM is defined as follows: PCM=(C)+(Si)/30+(Mn)/20+(Cu)/20+(Ni)/60+(Cr)/20+(Mo)/15+(V)/10+5(B). Here, (M) denotes a content (weight %) of a component M in the weld metal.On the other hand, a coating flux of the high cellulose type coated electrode contains relative to the total amount of the coating flux, 0.1 to 7.0% of MgO, 7 to 25% of iron oxides (in FeO equivalent), 8 to 19% of TiO.sub.2, 10 to 30% of SiO.sub.2 and 5 to 27% of Mn, and a core wire and/or the coating flux includes 0.06 to 1.10% of Mo relative to the total amount of the welding electrode. A ratio of the weight of the coating flux to the weight of the welding electrode being 0.10 to 0.19. By this, preferential corrosion resistance, toughness and crack resistance can be improved in the weld metal of a girth weld zone of a pipe which might be exposed in a corrosion environment containing CO.sub.2.
摘要翻译：贱金属和高纤维素型焊接电极的化学组成被调节在预定范围内，从而可以将从焊接获得的焊接金属的化学组成调节在预定范围内。特别地，对于焊接金属，焊接金属中的Mo含量（Mo）1和母材中的Mo含量（Mo）2调节为使得两种含量之间的差ΔTA（Mo（=（Mo）1 - （Mo）2）为0.03％以上，PCM为0.30％以下，PCM定义如下：PCM =（C）+（Si）/ 30 +（Mn）/ 20 +（Cu）/ 20 +（Ni）/ 60 +（Cr）/ 20 +（Mo）/ 15 +（V）/ 10 + 5（B）。这里，（M）表示焊接金属中的成分M的含量（重量％）。另一方面，高纤维素型涂布电极的涂层焊剂相对于涂层焊剂的总量，MgO的0.1〜7.0％，氧化铁的7〜25％（FeO当量），8〜19质量％的TiO 2，10〜30％的SiO 2和5〜27％的Mn，并且芯线和/或涂层焊剂包含相对于焊接电极总量的0.06〜1.10％的Mo。涂层焊剂的重量与焊接电极的重量的比率为0.10〜0.19。由此，可以在可能暴露在含有CO 2的腐蚀环境中的管道的环形焊缝区域的焊接金属中改善耐腐蚀性，韧性和抗裂性。

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