14. If surface defects are found, remove defects by grinding to a maximum depth of 0.060 in. (1.5 mm). Larger defects must be removed per afore- mentioned procedures. Spot welding requires preheating and postheating. ANNEX B TOE HAMMER PEENING EQUIPMENT: Hand held pneumatic hammer Adequate air supply Adequate lighting 0.25 in. (6 mm) diameter spherical tip bit Protective clothing, gloves, including eye, face, and ear protection. NOTE: Peening shall only be performed after weld acceptance by visual inspection. 1.
The toe of the weld should serve as a guide for the peening tool resulting in the area of deforma- tion being approximately equally divided between the base material and the weld metal face to the specified depth and not to exceed 0.19 in. (5 mm) in width. NOTE: Only the top layer of welds should be peened in multiple pass welds. 2. Welds must have a smooth profile and the toe must have a good transition to parent material (no overlap) before peening operation is performed. Grinding weld face and toe area is permitted to correct unacceptable conditions. Visual inspec- tion/acceptance is to be done after peening with appropriate radius and depth gauge. 3.
The hammer tool should be held at approximately one half the included angle between the weld face and the parent material and perpendicular to the direction of travel. This will normally require approximately four passes of the peening tool with the pressure of near full operator weight being applied. The depth of the indentation must be between 0.20 in. to 0.030 in. (0.6 mm to 0.8 mm). Page 4-4 930E FIELD ASSEMBLY MANUAL FAM0403 Field Welding Procedures