PLATE 3688000 - Caterpillar

Illustration 74 g03858375
Consistent peen groove depth.
Inspection
All weld lengths modified with the TIG toe dress, toe grinding, or ultrasonic peening process shall be visually inspected for acceptance. No visible discontinuities are permitted such as porosity, inclusions, lack of fusion, voids, overlap, and cracks. When the Toe Grinding process is used, reduction in the cross-sectional thickness of the base material shall not exceed 2.0 mm (0.08 inch). A minimum of 3.0 mm (0.12 inch) toe radius for the full length of the treated weld toe is required. A suitable radius gage shall be used to verify the TIG toe dressing (TTD) weld to the minimum radius requirements. Undercut on the TTD weld toes should not exceed 0.5 mm (0.02 inch) in depth. Undercut should be checked with a gage that has a minimum of 0.5 mm (0.02 inch) accuracy. The weld size shall be measured after the manufacturing process of the weld to ensure that throat size was not compromised during the weld toe treatment. Sharp transitions from the TTD to base metal and TTD to the original weld metal are not acceptable.
Illustration 75 g03858380
Radius gage capable of measuring the weld toe radius.
Appendix
Reference Books
Metals and How to Weld Them. Published by The James F. Lincoln Arc Welding Foundation, Cleveland, Ohio.Procedure Handbook of Arc Welding Design and Practice. Published by Lincoln Electric Company, Cleveland, Ohio.Welding Design and Fabrication. Published monthly by The Industrial Publishing Corporation, Cleveland, Ohio.Welding Design and Fabrication Data Booke. Published biennially by The Industrial Publishing Corporation, Cleveland, Ohio.Welding Engineer. Published monthly by the Welding Engineer Publications, Inc., Rochelle, Illinois.Welding Handbook. Published by the American Welding Society, New York, New York.Glossary
Arc Length - The distance from the end of the electrode core to the surface of the puddle of molten metal.Arc Stream - Molten particles of electrode material flowing from the electrode to the puddle of molten metal.Arc Welding - A process of fusion welding in which the heat from an electric arc is utilized to melt the adjacent surfaces of the pieces to be welded.Axis (of a Joint) - A line through the weld deposit in a joint perpendicular to the cross section at its center of gravity.Back Blow - Deflection of the arc away from the direction of travel. See Magnetic Arc Blow.Back-up Plate - A plate placed behind a wide gap weld joint to retain the molten weld metal and insure complete penetration and fusion at the root of the weld.Base Metal - See Parent Metal.Cold Lap - A void between the weld deposit and parent metal caused by insufficient fusion.Crater - The depression in a weld deposit caused by displacement of molten weld metal by the force of the arc stream.Depth of Penetration - The distance from the surface of the parent metal to the root of the weld.Electrode Angle - The angle that the electrode makes with the axis of the joint or the surfaces of the weldment members.Flat Position - A joint position where both the axis of the joint and the face of the