Post by account_disabled on Dec 28, 2017 1:01:43 GMT -5
I have a repeat job of TIG welding .375" thick 6061 plates to form a water-tight chill plate.
All component profiles are water jet cut.
Standard weld prep and cleaning is performed. (minus wiping with rag because of lint collecting on rough surfaces)
The edge welds go very nicely because the surfaces in the joint are mill finish.
The top and bottom welds are usually impure with quite a bit of porosity in the puddle. I can backstep the puddle a little to smooth the puddle but porosity still remains in the weld.
This requires machining out the weld and rewelding.
The interior cavity is open so there is no pressure build-up.
I'm thinking the water-jet finish is causing this.
I have SS wire-brushed the surfaces to shiny and still have this problem.
The water jet shop cuts alot of steel forgings and SS, as well as composites. Water in this area is high in minerals and iron.
Has anyone else encountered this? If so, is there a surface prep that helps?
Please help.
Thanks!
I didn't find the right solution from the Internet.
References:
www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-and-fab/problem-tig-welding-water-jet-cut-parts-307600/
Creative Medical Animation
All component profiles are water jet cut.
Standard weld prep and cleaning is performed. (minus wiping with rag because of lint collecting on rough surfaces)
The edge welds go very nicely because the surfaces in the joint are mill finish.
The top and bottom welds are usually impure with quite a bit of porosity in the puddle. I can backstep the puddle a little to smooth the puddle but porosity still remains in the weld.
This requires machining out the weld and rewelding.
The interior cavity is open so there is no pressure build-up.
I'm thinking the water-jet finish is causing this.
I have SS wire-brushed the surfaces to shiny and still have this problem.
The water jet shop cuts alot of steel forgings and SS, as well as composites. Water in this area is high in minerals and iron.
Has anyone else encountered this? If so, is there a surface prep that helps?
Please help.
Thanks!
I didn't find the right solution from the Internet.
References:
www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-and-fab/problem-tig-welding-water-jet-cut-parts-307600/
Creative Medical Animation