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Da Welder,
As Flash has stated it is dependant on what process and application you are doing.
Personally I hate VRDs.
When I was back on the tools I did predominantly pipe welding with Tig, 7016s and 7018s.
The low hydrogen electrodes are an absolute nightmare to get started with a VRD in the circuit. There may be an art to it but I never discovered it.
A lot of machines manufactured now come with the VRD internally wired into the circuit.I would personally buy an external unit that you plug your leads into, use it when you are on a site that requires it and don’t use it when it is not a requirement.
Good luck whichever way you go,
Cheers,
BBVRD stands for Voltage reduction device
typically they are only used for MMA (stick) welders and scratch start TIGs
the purpose of them is to reduce the OCV – Open Circuit voltage to a safer level to reduce the risk of electric shock
the latest version of AS1674.2 Safety in welding and allied processes lists three cat of environments
Cat A, B and C
if the temp is above 32 degrees it is automatically a cat C and requires the use of VRD
cat B has certain requiremenst for it
some sites particularly mines now specify that machines must be fitted with VRD
so to answer your question, it depends on the type of machine, what you will be using it for and where
but at the end of the day they are a good safety feature
R
Flash
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