【 Abstract 】 : There is a compressor cover, carbon steel material lap joint plate thickness of about 4mm, because the cover is pre-installed with electrical components. Therefore, CO2/MAG welding and robot welding are required. The welding current should not be too large, and the welding speed should be about 120 ~ 140cm/min to reduce the heat input and prevent overheating of the workpiece. Ensure the wind forming beautiful, air tightness qualified rate to reach 100%, and can be mass production. Generally, high speed welding is usually double-wire combination, laser +MAG welding combination, plasma arc welding or electron beam welding and other processes. The welding speed of CO2/MAG welding is generally 50 ~ 80cm/min, which should be solid

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There is a compressor top cover, carbon steel material lap joint plate thickness of about 4mm, because the top cover is pre-installed with electrical components. Therefore, CO2/MAG welding and robot welding are required. The welding current should not be too large, and the welding speed should be about 120 ~ 140cm/min to reduce the heat input and prevent overheating of the workpiece. Ensure the wind forming beautiful, air tightness qualified rate to reach 100%, and can be mass production.

Generally, high speed welding is usually double-wire combination, laser +MAG welding combination, plasma arc welding or electron beam welding, etc. The welding speed of CO2/MAG welding is generally 50 ~ 80cm/min. To achieve high speed welding, the welding process should be improved appropriately.

Welding equipment used for VR - 006 - g Ⅱ welding robot, the robot adopts the WINDOWS CE operating system, easy operation, reliable operation. Up to 5 sets of digital welding power supply can be connected through serial port, and the welding current waveform can be precisely adjusted in the teaching box. Under the condition of high speed welding, uniform and full forming of weld can be achieved. The guiding idea in technology is to increase arc diameter by changing arc shape; Increase the amount of metal deposited per unit time; The weld forming can be improved by changing the mixture ratio and reducing the surface tension of molten pool. The specific measures are as follows:

Welding machine improvement: make appropriate modification or select suitable welding machine to increase the amount of metal deposited per unit time, improve the bad fusion at both ends and make the welding seam wider. Ternary gas mixing: 93%Ar+5%CO2+2%O2 can increase the heat input, reduce the critical current value during droplet jet transition, and increase the adjustable range of the specification. Reduce the occurrence of edge - bite when arc voltage is high. Reasonable operation, high speed welding, arc lag behind Hans movement, droplet transition off the axis. Adjust the Angle of the line gun, and make the welding gun at an Angle of 60° from the tangent of the circumference to avoid the phenomenon of arc deviating from the axis. The influence of the extended length of the welding wire is very sensitive in high-speed welding. The length change of 3 ~ 5mm and the current change of 30 ~ 50A will make the weld width and width different. The extended length of the welding wire should be strictly controlled.