紫銅具有高的导热性和大的热容量,焊接时要求較大的热源,手工焊接时必須予热。因此热影响区增大,由于較长时間加使銅氧化,并在焊接时易于吸收气体使焊縫出現各种缺陷(气孔、裂縫等)。銅加热时无再結晶过程使热影响区組織粗大也降低焊接接头性能。因 Copper has high thermal conductivity and large heat capacity, welding requires a larger heat source, manual welding must be hot. As a result, the HAZ increases, oxidizing the copper for a longer period of time and easily causing gas welds to cause defects (pores, cracks, etc.) in the weld. No recrystallization during heating of the steel causes the HAZ to coarser and also reduces the performance of the welded joints. because