Question

could anyone explain the difference bn by and through (especially to say how something is performed)
for example:
1.metals are joined by welding
2.metals are joined through welding.​

Answer 1

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Welding. Conventional welding processes such as shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and submerged arc welding (SAW) have been used to weld dissimilar materials in metal-to-metal joints.