Wave soldering with the increasing awareness of environmental protection has a new welding technology. Used to be tin-lead alloy, but lead is heavy metal on the human body has great harm. So now there is the production of lead-free process. It uses a * tin-silver-copper alloy * and a special flux and welding temperature requirements higher and higher preheating temperature also need to say a little bit in the PCB board after the welding area to set up a cooling zone workstation. This is in order to prevent thermal shock on the other hand if there is ICT, it will have an impact on detection.
The wave soldering basically can be solved, it is slightly larger relative small component solder, he and reflow solder different place in this, and reflow soldering it to the board and components heating, in fact, the original brush to the solder paste to liquefied, to achieve the element and the board of the mesh.
1. reflow Zone, reflow zone, cooling zone. In addition, wave soldering is suitable for hand-inserted plate and dispensing board, and requires all components to heat, over the crest surface can not have once SMT solder paste components, SMT solder paste board can only over reflow soldering, can not use wave soldering.
2, wave soldering is through the tin trough to dissolve the solder into liquid, using the motor to stir to form the crest, so that PCB and parts welding, generally used in the hand plug-in welding and SMT glue board. Reflow soldering mainly used in the SMT industry, it through hot air or other thermal radiation conduction, will be printed on the PCB solder paste melting and welding.
3, the process is different: wave soldering to the first spray flux, and then after preheating, welding, cooling zone.