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钢材焊缝中的铜含量,如果很低(一般认为不超过0.3～0.5％)时,不会引起裂纹。我国普通低合金钢中即有含微量铜的,这类普低钢抗大气腐蚀性能较好。
Steel welding seam copper content, if low (generally considered not more than 0.3 to 0.5%), will not cause cracks. China’s ordinary low-alloy steel that contains traces of copper, this type of ordinary steel anti-atmospheric corrosion is better.