co2保护焊(国外英文资料).doc

co2保护焊(国外英文资料) 1. introduction Carbon dioxide welding welding, referred to as CO2 as it is an arc welding method using CO2 gas protection. 2. welding machine Brief introduction of carbon dioxide welding One 3. characteristics and Application CO2 gas shielded arc welding and manual arc welding, submerged arc welding electric arc welding electric, has the following characteristics: A. high efficiency: because the current density of CO2 welding arc, the heat utilization rate is high, without welding slag, therefore Compared with manual arc welding with high productivity; B. low cost: CO2 gas prices, and low power consumption, lower cost; C. small welding deformation: CO2 welding arc welding heat concentrated, small heating area, so the small deformation; D. good welding quality: CO2 weld hydrogen content is less, good crack resistance and good mechanical properties of weld; E.: simple operation can be observed when welding arc and weld pool, easy welding deviation, suitable for all position welding, easy to master; F. adaptability: CO2 welding for carbon steel and low alloy steel, can be used for all position welding. In addition to the welding structure, is used for welding repair and wear parts, our company is mainly used to connect the valve seat and the valve body welding, welding and casting. The shortcoming is: such as the use of high current welding, weld surface forming as submerged arc welding, welding is not easy to splash more; oxidation of nonferrous metals. It is not in the field or windy place welding. Two, CO2 gas shielded welding process parameters In order to ensure that the CO2 welding can obtain excellent welding quality, in addition to the right of the welding equipment and welding materials Also, should choose reasonable welding parameters, including: wire diameter, welding current, arc voltage, wire extension The length, welding speed, gas flow, power supply polarity and circuit inductance and other eight kinds of process parameters. 1. wire diame