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  #41  
Old 01-26-2016, 10:53 AM
crystallographic crystallographic is offline
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Default TIG brazing aluminum machined stock to sheet

I think a good example of the 40F difference between the melting points of parent metal and a braze filler is this one:

P1080536 tig braze_aluminum.jpg
You are looking at a German-made aluminum heat exchanger, air/oil.
This design has been around for a long time, but the fittings and bracketry change per application (Mercedes 300).

Problem: orig. exch. too old and decrepit and new ones are NLA. New one has the identical body but all machined fittings and bracketry are different.
Solution: Whack off all needed pcs from orig and all non-essentials from new body, and Trading Places happens via tig boy and alu braze.

Note: left side of machined alu fitting is next to factory furnace brazed joint, and my tig-braze fillet runs right up against the factory brazed fillet, but not melting it. Temps have to be delicately held to do this. (insert perspiration here)

(had zero leaks and part fit exactly, with no warpage.)

(ps, I first started doing tig-boy brazing in 1974, restoring a full set of 5 Very Rust Pitted wire wheels for a noted 12-string guitarist .... back to show-quality chrome, with zero defects. ... but I wuz young and got lucky and had zero pits in da krome .... )
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  #42  
Old 01-26-2016, 12:07 PM
supervee supervee is offline
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Kent,
What is you comment about using silicon bronze to reinforce the outside of mild steel exhaust header tubes at the flange ? ( TIG welded on the inside of the flange ).
Have you found cracking an issue ?
Is brazing rod a better option ?
Thanks
Dave
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  #43  
Old 01-26-2016, 10:58 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by supervee View Post
Kent,
What is you comment about using silicon bronze to reinforce the outside of mild steel exhaust header tubes at the flange ? ( TIG welded on the inside of the flange ).
Have you found cracking an issue ?
Is brazing rod a better option ?
Thanks
Dave
I've seen the tig bronze laid on those joints many times, as it saves the headers from separating there a little bit longer. If the headers have many miles on them be careful of the thin spots.
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  #44  
Old 01-27-2016, 05:09 AM
KAD KAD is offline
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Some nice welding info on this from a supplier.

Silicon Bronze welder setup parameters for TIG and MIG

♦ RECOMMENDED WELDING PARAMETERS:
*GMAW (MIG) Parameters (DC Reverse Polarity) Electrode Positive Spray transfer
Wire Diameter Amps Volts Argon (cfh) Wire Feed (ipm)
0.030 130-150 21-23 25 460-500
0.035 145-185 23-25 30 400-440
0.045 195-215 26-28 30 280-310
1/16 260-280 27-30 40 150-210

*GTAW (TIG) Parameters (DCSP) ² Electrode negative or ACHF
Material 2% Thoriated ² Filler Wire Size Amps (DC) Amps (AC) Gas Cup Argon (cfh)
1/16” 1/16” 1/16” 70-150 70-150 3/8-1/2 15
3/32”-1/8” 3/32” 3/32” 150-200 140-230 7/16-1/2 15
3/16”-1/2” 1/8” 3/32”-1/8” 230-400 225-320 7/16-1/2 20
1/2”-1“ 3/16” 3/16”-1/4” 325-500 290-485 1/2 25
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Last edited by KAD; 01-27-2016 at 06:35 PM.
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  #45  
Old 01-27-2016, 01:03 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by KAD View Post
Some nice welding info on this from a supplier.

♦ RECOMMENDED WELDING PARAMETERS:
*GMAW (MIG) Parameters (DC Reverse Polarity) Electrode Positive Spray transfer
Wire Diameter Amps Volts Argon (cfh) Wire Feed (ipm)
0.030 130-150 21-23 25 460-500
0.035 145-185 23-25 30 400-440
0.045 195-215 26-28 30 280-310
1/16 260-280 27-30 40 150-210

*GTAW (TIG) Parameters (DCSP) ² Electrode negative or ACHF
Material 2% Thoriated ² Filler Wire Size Amps (DC) Amps (AC) Gas Cup Argon (cfh)
1/16” 1/16” 1/16” 70-150 70-150 3/8-1/2 15
3/32”-1/8” 3/32” 3/32” 150-200 140-230 7/16-1/2 15
3/16”-1/2” 1/8” 3/32”-1/8” 230-400 225-320 7/16-1/2 20
1/2”-1“ 3/16” 3/16”-1/4” 325-500 290-485 1/2 25
Great - thanks - but the topic is TIG brazing? Tig bronze, Sibronze??
not MIG or TIG welding?
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  #46  
Old 01-27-2016, 06:33 PM
KAD KAD is offline
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Quote:
Originally Posted by crystallographic View Post
Great - thanks - but the topic is TIG brazing? Tig bronze, Sibronze??
not MIG or TIG welding?
Those are the parameters given for Silicon Bronze TIG and MIG setup of welders.

I thought it was interesting that they listed both DC electrode negative and ACHF (High Freq) setups for TIG.

Sorry I thought that it was pertinent information to this discussion

(I added a line stating that it was for silicon bronze)
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Last edited by KAD; 01-27-2016 at 06:36 PM.
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  #47  
Old 01-27-2016, 07:28 PM
weldtoride weldtoride is offline
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Quote:
Originally Posted by KAD View Post
....I thought it was interesting that they listed both DC electrode negative and ACHF (High Freq) setups for TIG....
After reading on another forum about it, I tried tigging sil bronze on AC, very low cleaning setting, it flows out real nicely on AC.
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  #48  
Old 01-28-2016, 12:42 AM
crystallographic crystallographic is offline
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Quote:
Originally Posted by weldtoride View Post
After reading on another forum about it, I tried tigging sil bronze on AC, very low cleaning setting, it flows out real nicely on AC.
I always use AC.
So then, I guess DC is the automatic default setting ... ?
AH, well ... Sometimes the obvious solution .... isn't.
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