I have been aske the same question mate, basically you have to find an approved RTO who can issue the certification and go through them.
The TAFE system only issues exam papers twice a year, if your welder hasnt already got a cert he may have to do the module
“Select Welding Processes” before he can receive his quals. The prac side of it can pretty much be sat at any time.
I have some TAFE teaching experience and Cert4 TAA, this has helped because I am about to kick off an in-house class of 10 blokes who
will be enrolled through TAFE but I will deliver the training, and we only have to cover enrollment fees and 2 visits from a TAFE assessor.
This makes a big difference to cost, these days a pressure ticket costs around $2300 each and there are no guarantees you will pass.
A lot of blokes choke on the day and fail when they are really good welders.
As you know welders dont have to be certified to AS1796, you can qualify them to just about any code you want if they are good.
Try the WTIA they make visits for welder quals but I think you will pay handsomely for the service:)
Good luck with it mate!!