一、铜的可焊性紫铜是可焊性较差的材料,对于厚度较大、技术要求高的紫铜与钢的焊接就更加困难。 1.焊缝金属与母材不易熔合。这是紫铜焊接时最主要的困难。据一些资料介绍在室温下紫铜导热能力大约是钢的七倍,而在l000℃时大约是十倍。由于焊接区获得的热量不能迅速累积到使紫铜充分熔化的程度,因而存在未熔合或焊不透的现象。板材越厚这一问题越严重。当板厚在6毫米以上时就要求预热到150～600℃,同时还要加大焊接规 First, the copper weldability Copper is poor weldability of materials, for thicker, high technical requirements of the copper and steel welding even more difficult. 1. Weld metal and base metal is not easy to fuse. This is the most important difficulty when welding copper. According to some sources of information, the thermal conductivity of copper at room temperature is about seven times that of steel, and about ten times at l000 ° C. Since the heat gain in the weld zone can not be rapidly accumulated to such an extent that the copper is sufficiently melted, there is a risk of fusing or penetration of the weld. The thicker the board the more serious the problem. When the plate thickness of 6 mm or more requires preheating to 150 ~ 600 ℃, but also increase the welding gauge