This standard specifies the basic form and dimensions of submerged arc welding seam grooves. This standard applies to carbon steel and low alloy steel submerged arc welding joints.
GB/T 986-1988 history
2008GB/T 985.2-2008 Recommended joint preparation for submerged arc welding
1988GB/T 986-1988 Basic forms and sizes of weld grooves for submerged arc welding
GB/T 986-1988 Basic forms and sizes of weld grooves for submerged arc welding was changed to GB/T 985.2-2008 Recommended joint preparation for submerged arc welding.