Electric heating – Metal heating – By arc
Patent
1989-02-21
1990-04-17
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219 74, 21912511, B23K 916
Patent
active
049182870
ABSTRACT:
An apparatus and method produces multi-level heat input for nuclear fuel rod weld formation using a single current level power supply. Different levels of electrical power are produced to achieve a low heat, high heat sequence by imposition of a sequence of inert atmospheric cover gases of different ionization energies at the welding site to regulate voltage drop and thereby electrical power level and heat input level for arc welding of the nuclear fuel rod to take place. A first cover gas, such as argon, is supplied to the weld chamber in a first welding pass for producing a high electrical current level and low heat input level, whereas a second cover gas, such as helium or a mixture of helium and argon, is supplied to the weld chamber in a second welding pass for producing low electrical current level and high heat input level. The first cover gas has a lower ionization energy than the second cover gas which results in a lower voltage drop and lower heat input during the first pass compared to the second pass so that the desired sequence of low heat first pass and high heat second pass is achieved.
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Shaw Clifford C.
Westinghouse Electric Corp.
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