Best way to weld cast to mild steel?

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Hello yall.  I need to weld a Cast iron steel seat bracket onto a mild steel motorcycle frame. What is the best process to weld this? Can it be welded GTAW process? What filler rod will be the most optimal? I talked with a old timer welder he suggested I weld a bead with a stainless rod not sure what grade onto the cast part. Then weld ontop of the stainless ontop the mild steel does this sound like a goood Idea? I am thinking i should SMAW weld it but my uncle wants done in GTAW. Some advice would be great.
Reply:I personally would GTAW this with silicon bronze.  Thats my own personal thoughts.Aside from that, might need to check on this, but I dont see why you couldnt use a nickel rod(cast rod) to do the job.  But again youd want to verify this.  Should find documention from the consumable manufac.  I will look and reply if I get a sec.IF it Catches...Let it Burn
Reply:im going to have to side with Chris on this or you could braze itChuckASME Pressure Vessel welder
Reply:Originally Posted by chopper5im going to have to side with Chris on this or you could braze it
Reply:what i concoure with you is that bad lolololololLast edited by chopper5; 03-17-2006 at 08:27 PM.ChuckASME Pressure Vessel welder
Reply:I would TIG it ( GTAW) but thats just me, use a nickel based tig rod, like the Inconel you were asking about before, or a Hastelloy X or Hastelloy W rod. go to your local welding supply and see what hey have ( or what they suggest)
Reply:is the brack you speak of a gas tank mount for an HD?ChuckASME Pressure Vessel welder
Reply:Originally Posted by chopper5is the brack you speak of a gas tank mount for an HD?
Reply:thas what holds the tank's on my .....um......chopper wen i got it i thought it was cast steel till i tryed to weld it to the frame then im like Oh son of ab!tch  it's cast iron  but the was 10 years ago so i cant tellyou how i put it on and im not scrapeing off paint just to  look i think it's brazed on i did a loot of work to the frame and the rest of the bike to keep track of all of itChuckASME Pressure Vessel welder
Reply:You can't weld on something once it has been brazed if the joint you speak of was brazed at one point in time.Despite that drawback, I lean towards brazing in any iron to steel weld because the joint has known mechanical characteristics when completed.  A typical nickel/silver alloy brazing rod has a tensile strength of 70ksi.  When you weld a joint of dissimilar metals, you end up with a joint of unknown composition, therefore, you have unknown mechanical properties.  It may be very brittle and weak.
Reply:Originally Posted by All positionsHello yall.  I need to weld a Cast iron steel seat bracket onto a mild steel motorcycle frame. What is the best process to weld this? Can it be welded GTAW process? What filler rod will be the most optimal? I talked with a old timer welder he suggested I weld a bead with a stainless rod not sure what grade onto the cast part. Then weld ontop of the stainless ontop the mild steel does this sound like a goood Idea? I am thinking i should SMAW weld it but my uncle wants done in GTAW. Some advice would be great.
Reply:I've used nickle 99 before but make sure to preheat the cast first Bapnbird