Weld repair

I've traveled with my mobile welding service all over Ontario fixing broken welds. In my weld repair experience the initial cause of a broken weld was so called "cold weld". I think cold weld can happen to anybody because we, the welders, often do not think before striking an arc. Unfortunately, due to our negligence welders form a weld that lacks sufficient penetration, contains slag impurities or even empty pockets, and then such weld brakes due to lack of strength. Recognition of an imperfect weld I call "reading" the weld. Each welding technique has its own signs of a cold weld.