The main reasons for the overburning of tungsten electrodes in argon arc welding are as follows:
Excessive Current
The welding current exceeds the bearing capacity of the tungsten electrode, which can cause the temperature of the electrode to be too high, causing local melting or ablation.
Insufficient Or Poor Quality Of Shielding Gas Flow
The flow rate of the shielding gas is too low or contains impurities to effectively isolate the oxygen in the air, resulting in oxidative ablation of the electrodes.
Improper Electrode Polarity Selection
When the tungsten electrode is connected to the positive electrode (DCEP), the electrode is hot and easy to overburn, especially in DC welding, improper polarity use can exacerbate electrode burnout.
The Electrode Is In Contact With The Workpiece Or The Weld Pool
Improper operation causes the electrode to touch the weldment or melt pool, resulting in local overheating and mechanical damage to the electrode, which in turn causes overheating.
The Arcing Method Is Unreasonable
Frequent contact arcing or high arcing voltage may cause local high temperature at the electrode and promote ablation.
The Electrode Tip Is Poorly Shaped
Improper sharpening or damage to the tungsten electrode tip and poor arc concentration lead to overheating in some areas of the electrode.
Electrode Material And Quality Issues
Low-quality or unsuitable types of tungsten electrodes have poor heat resistance and are more prone to overburning.
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