The STRA test is a test of the thickness ductility of a steel plate (the Z direction).
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Different material welds differently depending on polarity. There are also different types of welding rods, so polarity must be tested.
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