Abstract
The study of CO2, gas shielded arc welding process invented by. H. SEKIGUCHI, was begun in 1953 to develop it in wide practical use, and it has been conducted with regard to the following three phases:
(1) study and development of electrode steel wires for CO2, (or CO2-O2) gas shielded arc welding process; improved arc-stability and notch toughness of weld metal and developed many kinds of commercial wire.
(2) development of wire manufacturing techniques; improved wire feedability, prevented wirecurling and developed automatic wire spooling machine.
(3) application to welded structures and expanding applications; proved the usefulness of the process in application to rear axle-housings and idlers.
