Material science is very important to welding.
The way a metal is heated and cooled determines its properties. When welding is done incorrectly it can result is very weak material around the weld. A very common place to see the effects of welding is around the weld of two pipes. After a period of time, a rust ring can form on either side of the weld (not right next to it, but a small distance away). Although the weld is strong, the surrounding material is weaker.
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roster welding
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
smaw welding is sheilded metal arc welding
what is the difference between ultrasonic welding & radiographic welding
Mainly In spot welding & resistance welding two type welding machines are used :- 1. Air Cooled & 2. water Cooled.