The argon arc welding machine needs to make preparations before welding.
First, cleaning before welding.
TIG welding machine is very sensitive to the contamination of weldments and filled metal surfaces, so the grease, coating, lubricant and oxide film on the weldments must be removed before welding.
Second, the security technology
The operator of TIG welding machine must wear hood, gloves, work clothes and work shoes to avoid ultraviolet and infrared burns under arc light.
Tungsten argon arc welding machines are basically equipped with high frequency arc starters. Although low-power high-frequency and high-voltage electricity will not shock the operator, in the case of poor insulation function, high-frequency electricity will burn the epidermis of the operator's hand, which is difficult to cure. Therefore, the insulation function of the welding handle must be checked frequently.
Usage skills of argon arc welding machine
Argon arc welding machine can be divided into manual welding, DC argon arc welding and pulsed argon arc welding. Each use method has advantages and disadvantages, which complement each other. Here are some tips on how to use these methods:
1. Manual welding: As the name implies, manual welding puts the "argon arc welding/manual welding" switch in the "manual welding" position and the "DC/ pulse" switch in the "DC" position. At this time, the "welding current" knob can be adjusted at will according to the user's requirements, and the standard current is selected for manual arc welding.
2.DC argon arc welding: Before welding, turn on the switch of argon cylinder and select the switch on argon flowmeter at the appropriate flow position. Then, set the "argon arc welding/manual welding" changeover switch to the "argon arc welding" position, set the "DC/ pulse" switch to the "DC" position, adjust the "current adjustment" knob to an appropriate current value, and press the torch switch. The arc striking mode of Steyr argon arc welding machine is high frequency arc striking, and the tungsten electrode does not need to touch the workpiece (to prevent the tungsten electrode from burning, do not touch the workpiece).
3. Pulse argon arc welding: This method is to put the "argon arc welding/manual welding" changeover switch in the "argon arc welding" position and the "DC/ pulse" changeover switch in the "pulse" position. Adjusting the knobs of "current adjustment" and "base current" to make the current adjustment greater than the base current can produce the effect of pulse welding. Pulsed argon arc welding can be used to correctly control the weld pool size and heat and cool each melting point, and is suitable for welding weldments with large differences in thermal conductivity and thickness.
Argon arc welding is a welding method in which argon gas is used to isolate a small space from the air, and then tungsten electrode rod is used as the conductor. Current, moving direction of tungsten electrode and electrode holder will directly affect the welding appearance. When the shape of tungsten electrode and the moving direction of electrode holder are correct, the current used for welding has an important influence on the formation of weld. If the current is too large, the molten pool (molten metal area) will also increase, forming a molten pool within the specified welding width. There is only one way, that is, reducing the welding current to control the area of molten iron, and the tungsten electrode as a conductor swings back and forth at the welding place to make molten iron melt in the small area reached by the tungsten electrode. Where the tungsten electrode leaves, it will solidify immediately. If the current is too small, it will form rough fish scales. If the current is right, it will form smooth and regular fish scales.
When the current and welding handle are stable, the shape of tungsten electrode is closely related to the formation of molten pool. The shape of tungsten electrode should be sharp, which is beneficial to the concentration of current. Tungsten electrode will inevitably be oxidized by iron water in the process of use, which will blunt the tax tip, disperse the current and form multiple small currents. When the tungsten electrode moves to the edge of the weld, it may form undercut phenomenon, which is not allowed in argon arc welding. The movement of the handle (that is, the movement of the tungsten electrode) directly affects the formation of the molten pool. Generally, the tungsten electrode should be parallel to the weld. When the current is too large, the upward inclination of the tungsten electrode will help the solidified molten iron below drag the molten pool above to prevent it from falling, and the moving speed of the tungsten electrode will also affect the molten pool. When the temperature rises, molten iron will easily fall down. If the tungsten electrode moves too fast, the temperature of the molten pool will be quickly lost, and the fish scales outside the weld bead will be rough, which will form unsightly.
Welding is an art, and a good weld is like a work of art!