How to eliminate craters at the end of a laser weld?
looking for some advice on eliminating the crater i m getting at the end of a weld this is on the id of a 3 sch 10 316l pipe welded 1gr on a positioner current settings cw power 1100 wobble freq 60 wobble length 2 1 wfs 30 cm min ramp up 100 ramp down 120 power comp 0 i tried increasing the ramp down to 1000 but i m still getting the crater shown in the pictures any recommendations on the best way to eliminate this could this be more of a technique termination issue with how i m ending the weld rather than a settings issue image 59 jpg image 60 jpg
1 Answer
if your ramp down is already set to 1000 ms then this is a technique issue if you are getting an er21 showing on your machine when the weld terminates it means that the torch nozzle is coming out of contact with the part and the laser is shutting off immediately leaving no time for the ramp down to actually happen the proper technique for termination to ensure that laser ramp down occurs is to turn your retract time on the wire feeder up to 0 15 0 2 seconds and then terminate your weld by letting go of trigger 2 small silver trigger while maintaining pressure on trigger 1 large colored trigger as you do this allow the torch to fall down onto the part as the wire retracts this will allow the nozzle to remain in contact with the part at all times ensuring that the laser continues to fire and ramp down fully at the termination
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