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1.填写下表中四种钢材的强度等级及焊接时应选用的焊条牌号,(4分) 2.结507和奥102两种焊条牌号中的汉字、数字各表示什么意思?(4分) 结507:结——表示该焊条为结构钢电焊条;50——表示焊缝金属的抗拉强度≮50公斤毫米~2;7——表示药皮类型为低氢型以
1. Fill in the strength level of the four kinds of steel in the table below and the welding rod should be used when welding brand, (4 points) 2. Knot 507 and Austria 102 two electrode brands in the Chinese characters, numbers indicate what is the meaning of each? (4 points) Knot 507: knot - said that the electrode is a structural steel electrode; 50 - that the tensile strength of the weld metal ≮ 50 kg mm ~ 2; 7 - that the type of skin is low hydrogen type