الفهرس | Only 14 pages are availabe for public view |
Abstract Armor steel Armox SOOTplates were successfully welded using three welding processes Manual metal arc with E307 austenitic stainless steel electrode, Metal inert gas with ER307 filler wire, and Tungsten inert gas with strips from the Armox SOOTplate. Non destructive tests were carried out on the produced joints like dye penetrant and radiographic tests. Austenitic stainless steel microstructure with different grains size was obtained from MMA and MIG welding processes, while TIG weld zone showed microstructure containing martensite, and upper bainite. The HAZ revealed over-tempered martensitic structure. MMA welding process achieved the highest values of impact energy at root and face due to the austenite St. St. microstructure, while TIG welding process gave the smallest impact energy at HAZ due to overtempered martensite structure. TIG welding process achieved the highest tensile strength of 1050 MPa, due to the martensite structure, then MMA 870 MPa and MIG 772 MPa due to austenite ~. St. St. structure. MMA welding process reach the smallest bending angle of 1150 before cracking under cracking load of 33 KN, MIG reached bending angle of 1300 under cracking load of about 27 KN, while in case of TIG welding process cracking occurred at biggest angle of 1500 under the highest cracking load of about 38 KN. Most of the microhardness measurements showed symmetric trends around the welding zone center for MMA, MIG and TIG weldingprocess. MIG weldment recorded microhardness value of 200 HV at weld zone, while MMA gave 250 HV at weld zone due to austenite St. St. structure, while TIG weldment achieved 300 HV at weld zone due to the microstructure containing martensite and upper bainite. Key words: Armor steel, manual metal arc, metal inert gas, tungsten inert gas, ND test, microstructure, tension test, microhardness, impact test. |