TOE GRINDING WITH ROTARY BURR EQUIPMENT: High speed rotary air tool (15,000-20,000 rpm) Tungsten carbide rotary burr 0.50 in. (12 mm) diameter with 0.50 in. (12 mm) spherical tip Adequate air supply Adequate lighting Protective clothing, gloves, includes eye, face, and ear protection 1. The toe of the weld should serve as a guide for the burr tool resulting in the material removed being approximately equally divided between the base material and the weld metal face to the specified depth and not exceed 0.31 in. (8 mm) in width. 2. The weld must have a smooth profile and the toe must have a good transition to the parent material (no overlap) before the grinding operation is per- formed.
Grinding the weld face and toe area is permitted to correct unacceptable conditions. Visual inspection/acceptance to be done after grinding with the appropriate radius and depth gauge. 3. The axis of the tool should be maintained at about 45° to the parent plate and inclined at about 45° to the direction of travel. The depth of the grinding must be between 0.030 in. to 0.040 in. (0.8 mm to 1.0 mm). The final surface should be clean, smooth and free of all traces of undercut or slag. FAM0403 930E FIELD ASSEMBLY MANUAL Page 4-5 Field Welding Procedures