Copyright Goodheart-Willcox Co., Inc. Chapter 18 Weld Inspection and Repair 277 • Crown height is too low, Figure 18-23. A low crown does not provide adequate reinforcement of the weld. Repair this type of defect with stringer beads to minimize weld shrinkage. Add only enough new fi ller metal to build the crown to height requirements. Do not overweld. • Surfacing or overlay weld height is too low, Figure 18-24. Surfacing or overlay that is not high enough reduces the durability and service life of the surfaced material. Repair this type of defect with stringer beads to minimize dilution and distortion. • Fillet weld size is too small, Figure 18-25. A small fi llet weld does not provide adequate strength in the joint. The weld is repaired by removing the inadequate weld and rewelding to create the proper size fi llet weld. Regardless of the repair technique, these repairs require close control to avoid overwelding and adding additional stress to the original weld. Surface Defect Repairs Defects seen on the surface of the weld can extend deep into the weld. For this reason, the defect must be removed. After the defect has been removed, the area must be reinspected before a repair can be attempted. Common defects and factors to be considered when repairing them are as follows: • Longitudinal, transverse, or crater cracks, Figure 18-26. On steel and steel alloys, use a small grinding wheel like the one shown in Figure 18-27 to remove cracks. Remove only the amount of metal required to eliminate Required weld height Actual weld height Figure 18-23. A groove weld crown with insufficient height. Required overlay height Actual overlay height Figure 18-24. An overlay weld deposit with insufficient height. Required size Actual size Figure 18-25. Fillet weld leg length is satisfactory however, the weld is concave, which reduces the actual fillet weld size. Fillet weld Groove weld Crater cracks Crater cracks Transverse cracks Transverse cracks Longitudinal cracks Longitudinal cracks Figure 18-26. Types of cracks that may be found on groove and fillet welds.