封焊 meaning in English

seal welding
sealing weld
soldering and sealing

Cartridges for wall sealing , blasting and similar appliances . technical characteristics
封焊开采和其他相似机械.配接套管.特征
Electromechanical components for electronic equipment . basic testing procedures and measuring methods . part 12 : soldering tests . section 6 : test 12f - sealing against flux and cleaning solvents in machine soldering
电子设备用机电元件基本试验规程及测量方法第12部分:锡焊试验第六篇:试验12f在机器焊接中封焊处耐焊剂和清洁剂