With the introduction of foreign technology, Jinan Second Machine Tool Plant in 1981 applied first Φ1.6 solid core CO2 gas welding technology alternative the United States VERSON all-steel mechanical press companies Φ2.4 cored rich argon gas shielded arc welding process, presses large weldment welding process research and success. The project won the third prize of scientific and technological progress of the Department of Mechanical. 1986 Qiqihar Second Machine Tool Plant Application Φ1.2 solid core argon-rich gas shielded arc welding technology to solve the problems of large presses weldment welding and the copper filament argon arc welding technology, such as piston, cylinder workpiece surface copper layer surfacing alternative to our traditional copper sleeve succeed. Jinan First Machine Tool Plant in 1992 in the first application of the structural parts of the machine tools sheet cover Φ0.8 solid core CO2 gas shielded arc welding. During the Seventh Five-Year Plan "period, Jinan Second Machine Tool Works also CO2 gas shielded arc welding is applied to the the lengthened Welding Alloys presses tightening bolts on the project the machine tool industry, the Department of Mechanical the Seventh Technology Achievement Award. Gas Shielded Welding Wire high-efficiency welding technology has been widely used in the machine bed, gear, eccentric body, rocker shaft, cylinder, not machined after welding pipe flange and cover other parts, has become the machine tool industry one of the main process of welding.

Aluminate-based selection of newly developed test agglomerated flux OKFlax10.72 alkalinity of 1.9. The flux characteristics can withstand the high current, and the application of high-speed welding. Diffusible hydrogen content of the weld metal ≤ 5ml/100g. AC and DC. Deposited metal -50 ° C low temperature notched impact toughness up to the requirements of the European standard. In the narrow groove (50 °), multi-layer Welding Alloys slag removal.
On the strength of the joint performance requirements, selection process test a OKAutrod12.22 wire. The higher silicon content of this wire have a beneficial effect on deoxidation of the weld pool metal and flux slag removal. The impurity content in the wire is controlled at a relatively low level, which is very important to guarantee the low temperature impact toughness.
Welding heat input
50 +5 ° sided V-groove welding test plate, the blunt edge of 3 ~~ 5 mm. Underlying weld submerged arc Welding Wire (parallel) to a single supply dual welding heat input 19kJ/cm filling layer and cover the surface with two pairs of two-wire serial arc submerged arc welding, the welding heat input 27kJ/cm The test panels preheat 125 ℃, most high-level inter-temperature 250 ° C. The total number of the weld bead of the weld 31.