一、渗漏。一般用镀铅钢板或厚1毫米镀锡钢板进行钎焊。焊前先用5％的工业苏打水清洗油箱内部,以防箱内残留的燃油起火。钎焊时要使焊件连接处保持0.05～0.1毫米的焊接间隙,以使焊料能熔入间隙之间,保证焊接牢固。焊前还应用砂布或锉刀打磨被焊部位,直到露出纯金属为止,并给以预热。 First, leakage. General use of lead-plated steel or 1 mm thick tin plate for brazing. Before welding, clean the fuel tank with 5% industrial soda water to prevent the residual fuel in the tank from catching fire. Brazing welding joints to keep 0.05 to 0.1 mm at the welding gap, so that solder can melt into the gap between, to ensure the welding firm. Before welding also use emery cloth or file polished welded parts, until exposed pure metal so far, and give preheating.