Weld overlay, also known as cladding or hardfacing, is a process where one or more metals are joined together via welding to the surface of a base metal (substrate) as a layer. This is usually done to improve the base metal’s durability, corrosion resistance, or other properties. In the case of a steel pipe, a weld overlay can be used to enhance the pipe’s resistance to wear and corrosion.
A common method for weld overlay is a process called Submerged Arc Welding (SAW). In this process, a welding arc is submerged in a flux, which prevents atmospheric contamination. Other methods can include Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), and Plasma Transferred Arc Welding (PTAW).
The weld overlay process involves the following steps:
Overall, the weld overlay process can significantly improve the performance and lifespan of a steel pipe, making it a valuable technique in many industrial applications.
Base materials that can be weld overlay:
Corrosion-resistant materials that can weld overlay:
Several different types of filler materials can be used in weld overlay, depending on the desired characteristics of the final product. The selection of a particular filler metal depends on the base metal and the service conditions the final product will be subjected to. Here are some common types of filler materials used in weld overlay for steel pipes:
Remember, the choice of filler material should be based on the application of the pipe, the type of base metal, and the environmental conditions the pipe will be subjected to. The correct choice can improve the lifespan and performance of the steel pipe.
API 5L X65 STEEL PIPELINE
API 5L X52 and A106
API 5L GRB Welded pipes ,ERW , LSAW ,HFI
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