S9074-AR-GIB-010/278
shall be stored under clean dry conditions to prevent damage fm contamination, moisture, or water.
6.6.2.1 Exposed electrodes. Electrodes removed from holding ovens or hermetically sealed containers shall not be used if they are used in the atmosphere for more than 5 hours. Electrodes that have been exposed for more than 5 hours shall be stored in the holding oven for at least 8 hours or baked in accordance with 6.6.2.3. Electrodes that meet the moisture and moisture resistance requirements as specified in MIL-E22200/10 may be used for a period of 9 hours without baking. 6.6.2 Conditioning electrodes (MIL-types 9018, 10018, 11018, 12018, 10018-N1, and 410NiMo and type E2209-15/16. Electrode MIL-types 9018, 10018, 11018, 12018, f0018-N1, 410NiMo, and type E2209-15/16 shall be conditioned in accordance with 6.6.2.1 through 6.6.2.4. 6.6.2.2 Storage in holding ovens. Electrodes should be stored in holding ovens upon opening the hermetically sealed containers. Electrodes which have been baked shall be transferred to holding ovens before cooling to 150°F. The temperature of the holding oven shall be 225 to 300°F. 6.6.2.3 Baking. Electrodes shall be conditioned by baking at temperatures of 800 + 50°F (625 + 25°F for MIL-41ONiMo-XX) for 1/2 to 1 hour in a forced convection or circulation oven. The oven temperature at the time of loading shall not exceed 300°F and the electrodes should be spread in thin layers on trays. During baking, the temperature shall not be raised more than 300°F for each hour when oven temperatures are 500°F and above. Ovens should be automatically controlled and calibration shall be checked periodically at intervals of not more than 6 months. 6.6.2.3.1 Rebaking. Rebaking of electrodes is permitted, provided tests are performed on each electrode brand to confirm that the number of rebaking cycles to be used does not adversely affect weld deposit quality in accordance with governing specification requirements. 6.6.1.1 Covered electrodes (excluding MIL-types 9018, 10018, 11018, 12018, 10018-N1, and 410NiMo). Low hydrogen types, including ferritic, austenitic and nonferrous alloy types, except MIL- types 9018, 10018, 11018, 12018, 10018-N1, and 410NiMo or similar AWS or ASTM types (see 6.6.2) shall be used within 9 hours after removal from hermetically sealed containers or holding oven. The holding oven shall be a vented type and a temperature of 150 to 350°F shall be maintained. Electrodes exposed to ambient conditions for more than 9 hours after removal shall be held for at least 8 hours at 150 to 350°F in a vented oven prior to reissue.
6.6.2.4 Moisture test. Moisture test of electrode coatings at the jobsite is not required.
6.6.3 Submerged arc granular flux for general welding. .
6.6.3.1 Storage. Granular flux shall be stored in a dry area.
Original 71
Made with FlippingBook - Share PDF online