Re: Laser Weld Strength - Laser Welding Medical Instruments
If the customer hasn't provided any requirements, and this is a non critical device for non critical application, then as long as you follow good practice, and are aware of visual inspection criteria, all should be good.
If this is going to be an autogenous weld (no filler metal), look closely for crater cracks, throat cracks.
If you are going to use filler, be sure to use the proper filler, I believe E630 is the proper filler for 17-4, assuming the 17-4 has not been heat treated yet.
Look for discontinuities or defects such as undercut, underfill, overlap, any cracks. Cracks are never allowed regardless of size. Be sure weld profile is correct without excessive concavity or convexity.
Excessive concavity will result in a weaker weld, allowing for the possibility of cracking with repeated expansion and contraction cycles.
Excessive convexity could result in overlap at the toes of the weld, which could create a stress riser or notch, this could, under the right circumstances, be a place for cracks to propogate.