1 Welds the fixture to wear,TAB presents the displacement,causes TAB to be unable the normal card to enter in the welding hole,after forming the welding,has the resilience,creates the faulty soldered joint .
2 Welds in the process the soldering tin not to cool completely,the operator loosens the fixed fixture,after the TAB snapping back,produces falls off
3 Carries on the revision to the antidrip tin fixture,inspects on time.