本刊1988年1期上刊登的“全国手工电弧焊接技术选拔赛”专题刊出后,受到广大焊工的欢迎。但是,从我们最近收到的焊工刘成喜同志的一封来信,可以看出一个很有代表性的问题,即焊缝代号的新旧表示方法及说明,还未被广大青年焊工所熟悉和了解。为了更好地帮助广大青年焊工弄清这方面的问题,我们特请试题答案的供稿者清华大学金工教研室的龚国尚老师,来解答刘成喜同志信中所提出的问题,以飨广大读者。 The magazine published in 1988 1 issue of “National Manual Arc Welding Technology Trials” feature published, welcomed by the majority of welders. However, from a letter we recently received from Comrade Liu Chengxi, a welder, we can see that a representative issue, that is, the old and new method and description of weld code, has not yet become known and understood by the vast majority of young welders. In order to help the vast majority of young welders to clarify this issue, we specifically invite Professor Gong Guoshang, a contributor to the answer questions to answer the questions raised by Comrade Liu Chengxi in his letter to readers.