Is this True about converters??

Mrmopartech said

Tig welding a convertor is the best way to weld in the fins,as opposed to furnace welding,as this is a assembly line welding through a oven/furnace using a copper past.Check out the link,mrmopartech
http://heattreatment.linde.com/international/web/lg/ht/like35lght.nsf/repositorybyalias/apps_brazing/$file/Furnace%20brazing.pdf

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Tig welding only is done to the top and bottom of the vanes in the pump and turbine, and this can and will cause warpage of these parts if not done carefully.
Furnace brazing gets the material down the full length of the vanes to the shell, thus increasing the strength of the component. If you've ever seen the inside of a stock converter, you'll see that the vanes are not made of the thickest of materials and are only held in place by bending a tang typically at the top and the bottom of each vane, so if you're only welding the top in the case of really cheap converters or the top and bottom of the vanes how much stronger have you made the piece.