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Flashback and backfire have a lot in common. If a backfire happens, which is normally caused by holding the cutting torch too close to your work, the same thing can happen with high oxygen pressure and low fuel gas pressure. This deprives the cutting flame of gas, resulting in the flame being sucked into the torch head. When this happens, you will usually hear a popping sound that transforms into a whistling sound.<br><br>For extra safety during welding processes, flashback arrestor testing is required. Flashback arrestor testing is the process where flashback arrestors are checked for any malfuncti
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