INERT-GAS-SHIELDED CONSUMABLE-ELECTRODE WELDING OF MOLYBDENUM
As part of an over-all program to improve the ductility of molybdenum weldments, studies were imitiated to adapt the inert-gas-shielded consumable- electcode arc-welding process to molybdenum. This paper covers the work required to improve metal transfer and arc stabiliiy in molyhdenum arcs before starting complete evaluation of this welding process. Arc stability and metal transfer could be improved to the greatest extent by using d-c, straight polarify, an electrode wire coated with a compound to increase the emission of electrons, and a helium shield. These same conditions also produced the best weld-bead contour, and lessened the amount of weldmetal cracking due to shrinkage stresses developed in the weldment. Porosity was not evident when using either a leading-tralling shield or a dragging shield, and when welding on arc-cast molybdenum. Metallographic and bend-test comparisons were made between tbese welds and tungsten-arc welds in 1/8-in. thick molybdenum. The weld-metal grain size was ahout the same for both weldments. Room-temperature bend-test ductility was very low for both weldments. The results of this comparison indicated that the inert- gas-shielded consumable-electrode welding process may have its best application in welding thick molybdenum plate, whereas tungsten-arc welding would be better for welding sheet 1/8-in. thick or less. (auth)
- Research Organization:
- Battelle Memorial Inst., Columbus, Ohio
- NSA Number:
- NSA-12-005998
- OSTI ID:
- 4310916
- Journal Information:
- Welding J. (N.Y.), Journal Name: Welding J. (N.Y.) Vol. Vol: 37
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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