S9074-AR-GIB-010/278
6.3.2 Verifying temperatures. Preheat and interpass temperature shall be verified by periodic checks using such indicating devices as crayons or electrical potentiometers. Use of law melting metallic alloys for temperature measurement is prohibited. Crayon marks shall be located a minimum of 1 inch away from the weld area. Temperature indicating crayons shall not be used on S-51. S-52, and S-53 materials. For these materials the temperature shall be measured with a contact pyrometer. 6.4 Postheating. Unless otherwise approved, postheat of welded joints to relieve stresses and to improve the metallurgical and corrosion resisting properties of the heat affected zone shall be performed in accordance with table VI (ferrous alloy materials), section 8, and 6.4.1 through 6.4.6 (non-ferrous alloys). For dissimilar thicknesses, post weld heat treatment shall be based on the thicker member. Holding time at temperature shall be based on weld metal thickness, including reinforcement.
Original 61
Made with FlippingBook - Share PDF online