Because of its difficulty, the 6G certification is the industry standard for high-pressure, high-strength piping systems found in oil and gas refineries, power generation plants, and cross-country pipelines.
To pass a 6G test, a welder must control three variables with extreme precision: 6g pipe welding
: Stands for a groove weld , where the edges of two pipes are beveled to create a "V" shape for the filler metal. Because of its difficulty, the 6G certification is