The difficulty of repaired PCB

1. Parameter adjustments
 makes up the roll welding is the skill which namely simple needs to experience accumulates, the outstanding operator usually can judge the welding parameter according to the spot air burn degree which the welding the reliability and needs, because outputs the voltage is very low, the electric current is very big, each time welding effect all is decided by Canadas outside electrode bottom end load resistance, but decided the load resistance size the factor are extremely many, with makes up the contact resistance including two electrodes which tapes, makes up tapes the itself resistance and so on, meanwhile receives the surface roughness degree, the face of weld oxidation degree, clean degree, even the open air temperature humidity and so on the influence, strictEach time load resistance all is nearly dissimilar, therefore, can through observe the spot the situation to judge the parameter whether appropriate extremely important, can act according to the different situation to make the parameter the adjustment, can enhance the weld point greatly the quality and makes up the line the efficiency.The most effective accumulation this experience method is takes the abandonment board to carry on tries to weld, through the different line under the different board and the different parameter performance, understood the weld point air burn and the connection situation, this kind of experience accumulates after, made up the line to be able to become handy. In the ordinary circumstances, has the following rule, the heavy line and the big basis surface must use the big parameter   The greasy board wants the big rough surface in plywood parameter to have to be bigger than the burnishing surface parameter.

2. Electrode adjustments
 makes up the line machine electrode fixed part to fix by four piece of shrapnel connections, the goal lies in when meets about the electrode two side not smooth times can play the height automatic control role, because the electrode bottom surface is a burnishing surface, therefore welds time must guarantee the electrode bottom end is the smooth ability and makes up tapes the good contact.The electrode adjustment difficulty lies in the electrode fixed part is the shrapnel connection fixed around, but the electrode needs the very precise adjustment to be able to achieve and about consistent, if the electrode receives the external force to pull or the impact, the shrapnel on easy to have the deformation, because around smooth and about smooth adjustment time can the mutual influence.the prohibition had not understood this situation the non-operator operates the machine, because like this can maximum limit avoid the electrode the misoperation causing not smoothly, affects the welding effect and the speed.

   Moreover, the electrode will install good later to have to guarantee the stop plate already to be important, otherwise could frequently because the contact affected the welding current not reliably.The electrode height smooth judgment standard is grinds with a grindstone the electrode bottom surface on the sandpaper, if appears two color depth same mark, about showing smoothness has been very good, so long as the electrode nearby two all had the trace to be possible generally to carry on has welded, around smoothness request not too high, smooth might as far as possible.