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SHIELDING GASES
Shielding gas is directed by the torch to the arc and weld pool to protect the electrode and the molten weld metal from atmospheric contamination.
Argon and helium or mixtures of the two are the most common types of inert gas used for the shielding. Argon hydrogen mixtures are used for special applications.
Duty cycle The concept of duty cycle is to be clearly understood before operating any machine. Unlike the arc welding power sources, the resistance welding power sources are de
Choke: This is incorporated in the main air passage and used to control the air quantity to supply rich mixture. While starting an engine, the choke shuts off the air supply to th
In a 15 TR ammonia refrigerator plant the condensing temperature is 25 0 C and the evaporative temperature is -10 0 C. The refrigerant ammonia is subcooled by 50C before passing th
how to measure material hardness
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