solder

例句：

1. 1.The welding process is used to join metal together.
   焊接过程用于将金属连接在一起。
2. 2.The solder on the circuit board was not strong enough.
   电路板上的焊锡不够牢固。
3. 3.The worker carefully soldered the joints of the pipe.
   工人仔细地焊接管道的接头。