XGG overlay plate can be joined together by welding coated layer to coated layer with XGG welding materials and welding substrate to substrate with ordinary welding materials. Due to high parentage carbon in the overlay side, it is important that the overlay side shall not contaminate backing plate welds in fearing of embrittlement or cracks appearing on the welds. In cases where contamination is likely, SXGG recommends using stainless steel rod as transmission followed by XGG welding materials.