Some times the factories don't do much better. My brother in law bought a 78 Ramcharger brand new. 10 years later he was using it off road and the factory welded spring perch separated from the axle housing. The Ramcharger went sideways, and slid back down the hill he was climbing. Fortunately the RC didn't roll over and test the factory roll bar. Same issue, cold weld.

I think the problem is compounded by the guys that cry out about warping a housing when welding the perches on, and too many try to avoid the supposedly warpage by turning down the amperage when welding. I can say I've welded a lot of spring perches onto axle tubes in my days, and have never had a problem with warped axle tubes. Weld the perches on with the correct amperage and be done with it. The small amount of warp that may occur will cause a lot less damage then the damage a failed weld will cause. Gene