supermarket refrigerated showcase » article > commercial refrigeration > display cases How to use the gas welding equipment
display cases How to use the gas welding equipment
author: supermarket refrigerated showcase category: commercial refrigeration Views: 526Time: 2016-08-22
The valve opens and the fire operates. As shown in Figure 2-5-2. When both gases enter the welding torch, the ignition operation can be performed.
③When igniting an open flame, first turn on the gas-climbing control screw of the welding torch, and place the lighter at about 3cm from the left end of the welding torch to ignite the open flame. It is worth noting that the flame must not leave the welding torch after the open flame is lit . Can leave the welding torch mouth. , The flame left the torch nozzle. The cause of this situation is generally that the gas control knob is opened too much. If the oxygen control knob is turned on at this time, the open flame will be blown out.
If you turn on the oxygen control knob at this time, due to the excessive pressure of oxygen, it will cause backfire. When the backfire phenomenon occurs, you will hear the sound of and . It is an abnormal phenomenon that the flame leaves the welding torch nozzle or flashback occurs. When using gas welding equipment for welding, pay attention to avoiding the above two situations in the display cases. After igniting the open flame, adjust the gas control knob and oxygen control knob accordingly to make the flame reach normal. The flame did not leave the torch nozzle, and there was no flashback. When the flame is in a normal state, properly adjust the gas and oxygen control knobs to make the flame achieve the effect shown by burning.
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