焊丝外伸部分进行加热的熔化极电弧焊,能提高熔化系数和堆敷率。根据图1所示的加热方案,制造了用于焊丝外伸部分进行加热的气体保护自动焊焊头和软管半自动焊焊头。这种加热方案与其它加热方法比较有一定的优点:①不必象一般增大焊丝外伸长焊接时那样还需采用导向装置;②未使电路复杂化,不要求用附加电源来加热焊丝外伸部分。 Welding wire extension part of the heated melting arc welding, can improve the melting coefficient and deposition rate. According to the heating scheme shown in Fig. 1, a gas-shielded automatic welding head and a hose semi-automatic welding head for heating the welding wire extension are manufactured. This heating scheme compared with other heating methods have some advantages: ① do not need to use the guide device as the general increase of welding wire elongation; ② not make the circuit complicated, does not require additional power to heat the wire extension section.