Undermatching electrode applied to HT80 heavy plates for penstock
- Osaka Univ., Japan
The results of weld cracking tests in high humidity atmosphere, which is often experienced in the field-welding of penstock, show that the preheating temperature required is lowered by using the undermatching AWS E 9016G type electrode instead of the overmatching AWS E 11016G type electrode. In welded-wide plate tension tests at a temperature which is a little lower than the minimum service temperature experienced in the penstock, an appreciable difference in joint strength and joint ductility between undermatched and overmatched weld connections was not observed. Based upon the test results, a moisture-resistant, extra-low hydrogen type undermatching electrode, with a nominal tensile strength of 65 kgf/mm/sup 2/ (92,482 psi), was developed to satisfy design conditions required for penstock circumferential weld joints. The new type of electrode is found to lower the required preheating temperature by required preheating temperature by several tens of degrees Centigrade compared with the commercial E 9016G type electrode selected because of its moisture-resistant and extra-low hydrogen nature.
- OSTI ID:
- 6362621
- Journal Information:
- Weld. J. (Miami); (United States), Vol. 58:2; Conference: 59. Annual Meeting of the American welding Society, New Orleans, LA, USA, 3 Apr 1978
- Country of Publication:
- United States
- Language:
- English
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25 ENERGY STORAGE
MANGANESE ALLOYS
CRACKS
NICKEL STEELS
WELDED JOINTS
PUMPED STORAGE POWER PLANTS
PENSTOCKS
STEELS
CHARPY TEST
DUCTILITY
ELECTRODES
FILLER METALS
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
TEMPERATURE DEPENDENCE
WELDABILITY
WELDING
ALLOYS
FABRICATION
HYDROELECTRIC POWER PLANTS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
NICKEL ALLOYS
PEAKING POWER PLANTS
PIPES
POWER PLANTS
TENSILE PROPERTIES
360101* - Metals & Alloys- Preparation & Fabrication
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