welding radiator?
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  1. #1
    Fellow Frogger! amcc's Avatar
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    Default welding radiator?

    radiator in secoond car leaks around the thermo fan switch housing... needs to be welded... can i use mig? or do i need to brais it? i ask cos mig is sooo much easyer than oxy

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    Moderator Alan S's Avatar
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    From experiences I've had in the past, I'd be getting someone in the trade to do it.
    I'm a reasonably good brazer; I had to be in my trade, but I had problems doing a couple as I think you'll find it could be done in either blue or brown tip silver solder. Problem is, the two have such different styles of metallic fusion. Blue needs both parts of the job to be glowing min dull red to be able to puddle. It then suddenly goes to as thin as water making any sizeable holes hard to seal.
    Brown requires the job to be just below glowing and if it gets too hot, it runs to balls and won't stick. If you hit it with the MIG and it's a braze/silver solder job, methinks you might open a real Pandoras Box.


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    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by amcc
    radiator in secoond car leaks around the thermo fan switch housing... needs to be welded... can i use mig? or do i need to brais it? i ask cos mig is sooo much easyer than oxy
    Your going to use your MIG on a radiator It'll never be watertight if you do.

    Take it in and get it rodded, pressure tested & fixed. I'd be surprised if it's more than $60bux ... and it'll be well worth the $$$ as you know it's all been checked out.

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    Fellow Frogger! amcc's Avatar
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    bugger. i thought as much. will have a go with the oxy. the radiator hasnt been used since it was last looked at and is only leaking around the thermo fan switch housing. where the bit that pokes out joins the side tank.

    and yes it leaks cos i am so big and strong

    it damn easy to over tighten when you 24mm ring spanner is as long as mine. new i should have put the sensor in before i put the radiator in the car
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    Moderator Alan S's Avatar
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    Why not just run a bit of soft solder over it? Use plenty of flux and wipe across with a wire brush; that's all the pros do. After all, you want to plug a small leak not refit the entire enchilada


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    BVH Roger Wilkinson's Avatar
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    Quote Originally Posted by amcc
    radiator in secoond car leaks around the thermo fan switch housing... needs to be welded... can i use mig? or do i need to brais it? i ask cos mig is sooo much easyer than oxy
    If you would prefer not to braze it you would probably make a hash of it. And if you tend to be heavy-handed (e.g., with a 24mm spanner) you may well make even more of a hash of it. I would take it to a radiator specialist. I am half-reasonable at brazing and silver soldering and I don't do radiators myself.

    Anyway, I thought radiators were generally soldered with tin-based solder and you need a big soft lazy flame for that.

    Roger

  7. #7
    Fellow Frogger! amcc's Avatar
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    i would just take it somewhere but it is such a small crack! 10mm long and it only leaks when cold!

    reason i bumbled it puting the sensor in was that i did it in car. couldn't get right angle...
    French - 92 205mi16, 87 205gti and spares
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    Quote Originally Posted by amcc
    i would just take it somewhere but it is such a small crack! 10mm long and it only leaks when cold!

    reason i bumbled it puting the sensor in was that i did it in car. couldn't get right angle...
    Not a mig or tig job. You can use oxy/a for the following or LPG for the first two. Go with the origional i.e solder , silversolder or braze.
    Cheers

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    1000+ Posts jo proffi's Avatar
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    2 pack epoxsy has always fixed any holes I've made.I,ve used it succesfully to re-attatch the overflow nipple on the fuego, that I accidently snapped off,and there some holes on the yacht above waterline that are stuffed with the stuff.I use the putty that's 2 pac, but comes in one stick and you kneed it with your fingers.I think its called quicksilver, and por15 had a similar product.The quality of the fix is totaly dependant upon the quality of your preparation.
    Jo

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    1000+ Posts cruiserman's Avatar
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    if you think that a radiator (brass, plastic or possibly AL) is a job for a mig welder then I would suggest you take it to someone who knows what they are doing. If it is a small crack in the soldered area of a brass radiator, get some 50:50 pb sn solder and use a blowtorch flame, not an oxy flame to heat the area plenty of flux and the original solder may flow to fill the crack if not apply the stick of solder and the job should be done. Ensure that the radiator is both mechanically and chemically clean at the point to be fixed. If it is brazed, easy to tell, braze = golden in colour solder = silver take it to a radiator specialist as you will quickly discover that the point the brass filler melts will be 1 millisecond before the tank vanishes into a pool of molten brass.
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  11. #11
    Fellow Frogger! amcc's Avatar
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    thanks guys. think you have scared me enough. and seings that the place i took them to last time only charged $25 to fix it i think i will go back again.

    as for bagging out my welding skills... i can weld with oxy and ark. did a hell of a lot of time on them at school. used to join 1mm sheet with the oxy. but i was never actually taught how to use mig. can use it, anyone can. and cos i wan never shown haow to use mig was not sure what it could be used for... will keep you all posed

    for the fright
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  12. #12
    BVH Roger Wilkinson's Avatar
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    Quote Originally Posted by amcc
    i can weld with oxy and ark. did a hell of a lot of time on them at school. used to join 1mm sheet with the oxy.

    for the fright
    When you learned to weld at school you would have done it on nice, new, clean materials. Repair jobs are done on old, corroded, dirty materials. Chalk and cheese. Fusion welding 1mm sheet with nice clean edges is a piece of cake. I also remember a bloke at a field day selling ally rods by demonstrating how to fill a 10mm hole punched in the bottom of an aluminium can with the stuff. I had a go and was able to do it first time. So I bought a pack. But I have never had the same level of success when repairing old aluminium round the farm as I had on the nice clean can at the field day. Your situation with the radiator is likely to be similar. Do the easy jobs yourself but leave the tricky ones to an expert. Anyway, you don't have the right tools, because you need a primus type torch for this job.

    Roger

  13. #13
    1000+ Posts cruiserman's Avatar
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    Quote Originally Posted by Roger Wilkinson
    When you learned to weld at school you would have done it on nice, new, clean materials. Repair jobs are done on old, corroded, dirty materials. Chalk and cheese. Fusion welding 1mm sheet with nice clean edges is a piece of cake. I also remember a bloke at a field day selling ally rods by demonstrating how to fill a 10mm hole punched in the bottom of an aluminium can with the stuff. I had a go and was able to do it first time. So I bought a pack. But I have never had the same level of success when repairing old aluminium round the farm as I had on the nice clean can at the field day. Your situation with the radiator is likely to be similar. Do the easy jobs yourself but leave the tricky ones to an expert. Anyway, you don't have the right tools, because you need a primus type torch for this job.

    Roger
    I have seen (and bought) that aluminium welding stuff from the show. Same thing didnt work at home like it did at the stand. Next time I saw it I paid more attention - you have to thoroughly wire brush it with a stainless steel brush.
    Neil
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