When we welded, the first,we should select the appropriate welding gun according to the size, thickness and thermal conductivity of different situations weldment.
In operation, open the acetylene switch, then slightly open the oxygen switch, ignited acetylene gas, at this time the flame temperature is not high, the nozzle show two layers white flame core. Further, since the acetylene gas is excessive, so it happened incomplete combustion and black smoke. before welding, regulate oxygen switch, make appropriate proportion of oxygen and acetylene gas, combustion obtained high temperature.When welding, weldment joints is burn red hot, then we make melted electrode fill the joints and melt together, oxy-acetylene flame can be evacuated. After cooling,the welding is complete.
When welding is stopped, be sure to switch off the acetylene gas, close the oxygen switch until oxygen stream blows out remaining oxy-acetylene flame.
