metallurgy welding structural applications xrd analysis macro mapping electron probe micro analysis(epma) stainless steel filler high entropy alloys gtaw tig welding fullerence mwcnt swcnt cnt carbon nanotubes astm standard toughness fracture ductile brittle u-notch izod destructive testing v-notch charpy impact testing bridges steel preheat thermit exothermic aluminothermic thermite
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