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electroslag
electroslag adj. 
/iˈlɛktroʊˌslæɡ/, /əˈlɛktrəˌslæɡ/, /iˈlɛktrəˌslæɡ/ Metallurgy (attributive) designating processes for welding or refining metal in which heat is generated and transferred by means of a layer of electroconductive slag through which electric current is passed.
Brit. /ᵻˈlɛktrə(ʊ)slaɡ/
, /ᵻˈlɛktrə(ʊ)slaɡ/U.S. /əˈlɛktroʊˌslæɡ/
, /əˈlɛktroʊˌslæɡ//iˈlɛktroʊˌslæɡ//əˈlɛktrəˌslæɡ//iˈlɛktrəˌslæɡ/ΚΠ
1959 Metalworking Production 29 May 950/1 A molten pool of highly-ionized and consequently electrically conductive slag which transfers the heat instead of the arc itself—therein lies the secret of the ‘electro-slag’ welding technique.
1966 New Scientist 7 July 6/2 Electro-slag refining..is what the steelmaker calls a secondary refining process—one, that is, which refines an ingot of steel to higher standard of purity and structural perfection.
2001 R. W. Cahn Coming of Materials Sci. ix. 351 Advanced modern methods of high-temperature chemistry, such as electroslag refining, are needed for such purification.
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