Electric welding apparatus and plant; electric arc welding apparatus and plant; electric welding torches; gas-shielded electric arc welders; electric welders with automatic smoke removal; apparatus for cutting by electric energy; electric cutting torches; nozzles, jets, couplings, connectors, pipes, hoses, hose sets, connecting tube assemblies and feeders, all for inert gas supply in gas-shielded electric welding equipment; welding electrodes; welding electrode wire; feed apparatus for feeding welding electrodes and electrode wire; electric welding torch and cutter cleaning apparatus; electrical apparatus and instruments, electronic apparatus and instruments, transformers, metering apparatus, control apparatus and regulating apparatus, all for use in connection with welding and welding equipment; parts and fittings for all the aforesaid goods