double-end socket wrench
H sectional shape end socket
heating element socket welding of plastic pipe
socket welding connection
Girth Welding∥Welding Auxiliary Device
tungsten inert-gas welding welding
end-and-end effect (= end-to-end effect)
end-to-end effect (= end-and-end effect)
SIGMA welding (MIG welding, Metallic Inert Gas Arc welding)