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Tungsten preparation and circuit selection for tig welding different metals

26/4/2017

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Tungsten preparation and circuit selection for tig welding different metals
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In this video titled “Tungsten preparation and circuit selection for tig welding different metals
” Glen Jones explains the correct method of tungsten preparation and circuit selection for tig welding different metal types.
These techniques will help and assist all welders when it comes to setting up a tig welding plant to weld successfully.
The tungsten preparation shown are either ball end for welding aluminium or ground to a point which is required when welding carbon steel and all other metals. Explanation is also given which circuit setting is appropriate for the metal which is to be welded.
TIG stands for Tungsten Inert Gas, which is also known as the GTAW process which stands for Gas Tungsten arc welding. The GTAW / Tig process use Pure Argon gas as the shielding gas to protect the arc from the atmosphere, Argon is an inert gas.
In this video we are looking at Tungsten preparation for tig welding different metals.
We will discuss the 2 types of Tungsten preparations and there applications.
The grinding will be performed on a bench grinder and note we only use the face of the grinding wheel not the sides.
The sharp point being prepared on this Tungsten is for welding all metals except aluminium.
When welding with this preparation, make sure you weld with DC-ve polarity . If we welded with DC+ve  polarity we would overheat and melt the tungsten, so ensure you are on DC-ve polarity. This is the preparation for all metals other than aluminium.
When we prepare this tungsten we aim for the length of the point from tip to shoulder to be approx 2.5 times the diameter of the electrode.
Now we look at the preparation for welding aluminium. A sharp point is not permitted when welding aluminium because the arc is to concentrated for the low melting temperature of aluminium. A slight chamfer on the end of a clean tungsten is sufficient. When welding Aluminium ensure you are welding using the AC circuit.
 
 
Click on the times below next to the relevant topic and the video will start at this point.
Which part of the grind stone to use 0:15
Sharp point preparation 0:20
Length of tungsten to be ground  0:36
Ball end preparation 0:50
Additional videos on my youtube channel “glen jones industrial” that you may find interesting are;

​For more useful links and articles please click on the Tutorial Videos Link

​Regards
Glen Jones
the boiler shop.com.au

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