I hate to break it to you pal, but it's not GTAW process...
Here's the process... It's CMT which means Cold Metal Transfer, and it's a relatively new method of GMAW metal transfer developed by Fronius GmbH.
How do I know this for a fact? Well, let's just say that I find things and I found this which comes from the company that the OP mentioned in his second post:
"Weld metal overlay (cladding) High weld metal overlay quality with 10 UHLIG features:
1) Use of 4-component inert gas He 30s - specially developed for UHLIG weld metal overlay
2) Use of innovative CMT* welding technology (*Cold-Metal-Transfer) C/o Fronius
3) Two parallel welding burners per rig
4) Vertical-down welding position
5) Double-layered weld metal overlaying
6) Intelligent strengthening layer structure in the particularly corrosion-prone fin area
7) Double blasting prior to weld metal overlaying
8) Shrinkage taken into account
9) Glass granulate blasting of the weld metal overlay surface
10) Circulated water cooling
Results: Minimal Fe content and uniform overlay weld thickness.
In fact, here's the link to "Uhlig's" site:
http://www.uhlig.eu/schweissplattieren.aspLook @ page two because that's where the above mentioned information comes from.
This is Fronius's Cold Metal Transfer process:
http://www.fronius.com/cps/rde/xchg/fronius_international/hs.xsl/79_9399_ENG_HTML.htmTake a look at the video's in the web page and you'll see that CMT is similar to short circuit transfer except for one big difference... The control of wire movement as the short circuit occurs is what makes it different, and if you read the article explaining the process, you'll understand better how this method of transfer really works...
This page explains it better than I could, so I'll defer to Fronius instead.
http://www.gxcme.edu.cn/jpkc1/hj060522/weld12.6/lesson/lesson5/5_1_6.pdfA good friend of mine named Stephan Engelhard who works for Fronius and used to frequently contribute here but, is currently workign on securing his Masters Degree in - oh I forgot whether it's Welding Engineering or material sciences with an emphasis on Welding Engineering, explained it all to me a few years ago when they (Fronius) first introduced the method of transfer process for commercial use... With this process, one can even join steel sheet to Aluminum sheet as well which is simply amazing to watch for an "old geaser" like myself.
Judging from some of the pics below, I do indeed see a slight bit of spatter yet, it's an amazingly huge improvement in cosmetically sound weld overlaying when compared to what is shown in the first picture from the Original Poster (OP), Barbaros.
Anywho, it's definitely NOT GTAW.
So enjoy the read and for Barbaros, I would suggest you contact Fronius USA to look further into this process or if it's more economically efficient, get in touch with UHlig Wel-Cor GmbH, or WSI/Aquilex's "Unifuse" weld overlay services... Here are their links:
http://www.uhlig.eu/index.asp?slcSprache=en&FID=&class=http://www.aquilex.com/pdf/unifuse-tube.pdfWell, that's it for me now... Btw, these pics are from Uhlig's website...I hope this clarifies any confusion and helps whoever needs it.
Respectfully,
Henry