Welding preheating is used to ensure weld quality and reduce the chance of cracking and other defects that can result in costly rework. Preheating is commonly used in field and shop applications when welding steel or steel alloy pipes or plates that are 1” thick or more. Applications that often use preheating include power plant and structural construction, as well as pipe fabrication. Here, Miller Electric outlines four common methods for welding preheating and how to choose the best option for your application.
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