| 主权项 |
1. An orbital welding process for joining adjacent ends of two steel boiler tubes comprising the steps of:
placing a weld ring on a first tube end, aligning a second tube end in said weld ring, such that said first and second ends are abutted together with an inner ring portion of said weld ring therebetween, wherein said weld ring having a T-shaped profile having said inner ring portion and an outer ring portion, and where said inner ring portion extends from an interior surface of said outer ring portion such that said inner ring portion is perpendicular to said outer ring portion, wherein said inner ring portion defines a length and each of said tube ends define a thickness, and wherein said length is greater than said thickness, ensuring the first and second tube ends are inserted entirely into the weld ring and the first and second tube ends rest against said inner ring portion of said weld ring by visually inspecting at least one notch in said outer ring portion of said weld ring, wherein said outer ring portion defines a width, and wherein said at least one notch extends said width of said outer ring portion, closing each of said at least one notches by tack welding, arc welding the adjacent tube ends together in a single orbital pass. |
