Preheating is a crucial step in many welding applications that slows the rate of cooling in a finished weld, in addition to lowering the amount of hydrogen in it and reducing the risk of cracking. Artificially introducing heat into the base metal — by means of an external heat source — adds a step to the welding process, however, it can save you time and money in the long term by reducing the potential for a failed weld that requires rework.

There are numerous methods for preheating the base material, each with benefits and drawbacks. The best choice for a specific application depends on several factors, including any code requirements that may apply. Consider these tips and best practices that contribute to proper preheating — and a high quality weld. 

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