电焊工考试题2（Welder test item 2）.docVIP

电焊工考试题2（Welder test item 2） Electric welder test Is a problem. (its a square root, not a picture.) Carbon dioxide gas shielded welding produces a lot of CO and smoke, which can rust the metal, so it needs proper ventilation. (a) The wind speed should be less than 1.5m/s in the working area. (a) Cylinders can be placed in direct sunlight or near a hot reservoir. (a) A power switch can connect two welding machines. (a) When the cable of the welding machine is too long, it can coil the spare part of the cable. (a) When installing the carbon dioxide pressure-reducing valve, the operator should stand on the side of the bottle mouth. (a) The welding parameters of carbon dioxide are: arc voltage, welding speed, wire diameter, electrode length, gas flux, etc. (a) Carbon dioxide shielded welding if the welding current is too small, the droplet is large, deep and shallow, and the arc stability is poor. (a) When welding speed increases, the weld width of weld width decreases. (a) When the welding speed is reduced, the welding deformation increases, and the stomatal bit and the unsolder are also produced. (a) The arc combustion is unstable when the arc voltage is too low. (a) When the arc voltage is too high, the arc elongates, and the large particles will splash. (a) The gas flow is small, the arc is not stable, the surface will be dark brown, and there are dense mesh holes. (a) The gas flow is too large, producing vortex, the weld surface is light brown. (a) In the normal welding condition, the welding current is below 200A, and the gas flow of carbon dioxide is 10-15l/min. (a) The distance between the nozzle and the workpiece does not affect the quality of the weld. (a) During general welding, the distance between the nozzle and the workpiece should be kept at 5mm. (a) The Angle size of the torch is not directly related to the shape of the weld and the defect effect. (a) If you cant keep the normal distance between the nozzle and the welding parts, it is very easy to create