cast aluminum, atv cylinder jug crack

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Preheat to 350 , syncrowave set to AC- balance 7, A356 filler, postheat to 350, open oven and let cool. Attached Images
Reply:Nice work castweld.
Reply:looks goodOLLIE
Reply:VERY nice workmanshipCo-Own CNC shop:Miller :1251 plasma cutter, MaxStar 700 TIG/Stick, & XMT 456 Multiprocess Welder.&  2 Hypertherm HPR260's Plasma CutterSorry I had a bad stroke but now I am back.
Reply:nice work
Reply:It appears that the internal threads are demolished.What was done to rectify the threads, presumably to fit and gage the stock head stud?Blackbird
Reply:No, don't fix it, that's one less ATV I'll have to deal with on the trails.
Reply:Originally Posted by dave powelsonIt appears that the internal threads are demolished.What was done to rectify the threads, presumably to fit and gage the stock head stud?
Reply:Aluminum blocksIf the overheating doesn't ruin 'em, fasteners willGreat repair job"Any day above ground is a good day"http://www.farmersamm.com/
Reply:castWhen you preheated, did you use a heat marker or how did you tell when  the cylinder was hot enough??
Reply:Very Nice!Too bad my own recent drama with cast aluminum didn't turn out for me.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Originally Posted by castweldPreheat to 350 , syncrowave set to AC- balance 7, A356 filler, postheat to 350, open oven and let cool.
Reply:What size Syncrowave? That's a very distinct bead (and pretty), did you use a pulser to do that? Or did you use a lot of pedal action? What color and diameter tungsten? The next comment is coming from a hobby weldor, not meant to question you: never heard of A356 filler. But it Googles right on top. It's always been a 4 digit alloy, 1100, 4043, 5356. I thought you typo'd 5356 and wondered how it could handle the elevated temperatures. Edit: Glad you two addressed the threads. I was almost aware there might be an issue.Edit 2: Dave beat my post.Last edited by Craig in Denver; 03-04-2009 at 09:24 PM.9-11-2001......We Will Never ForgetRetired desk jockey. Hobby weldor with a little training. Craftsman O/A---Flat, Vert, Ovhd, Horz. Miller Syncrowave 250
Reply:When I do something like that I put a new Grade 8.8 or higher bolt in and then tig weld with bolt in place. Later I gently tap on the bolt then move it a bit in both directions then remove the bolt and use a tap to chase out the hole. Work fine about 95% of the time otherwise I have to insert a helicoil which is something I try to stay away from using.Co-Own CNC shop:Miller :1251 plasma cutter, MaxStar 700 TIG/Stick, & XMT 456 Multiprocess Welder.&  2 Hypertherm HPR260's Plasma CutterSorry I had a bad stroke but now I am back.
Reply:Originally Posted by Ag SpecialtiescastWhen you preheated, did you use a heat marker or how did you tell when  the cylinder was hot enough??
Reply:Originally Posted by dave powelsonThanks for your response on the thread restoration.Question #2----you're using A356 filler rod---IOW---the samefiller as the parent casting??Question #3--if this is the case, where does one obtain such filler rod?
Reply:Originally Posted by Craig in DenverWhat size Syncrowave? That's a very distinct bead (and pretty), did you use a pulser to do that? Or did you use a lot of pedal action? What color and diameter tungsten? The next comment is coming from a hobby weldor, not meant to question you: never heard of A356 filler. But it Googles right on top. It's always been a 4 digit alloy, 1100, 4043, 5356. I thought you typo'd 5356 and wondered how it could handle the elevated temperatures. Edit: Glad you two addressed the threads. I was almost aware there might be an issue.Edit 2: Dave beat my post.
Reply:Okay!Found what Craig found on Google:Universal Wire Works is a supplier of the below:http://www.uniwire.net/AMS 4181Which---- is A356 filler rod.(Using this as opposed to 4043, or 5356 alum., would offer direct compatibility to the casting.A while back, there was a nasty debate about using these other two on castings and wedon't want to visit that again.)Castweld--thank you, for letting me know, there is a directly compatible filler to use.Blackbird
Reply:Originally Posted by specterWhen I do something like that I put a new Grade 8.8 or higher bolt in and then tig weld with bolt in place. Later I gently tap on the bolt then move it a bit in both directions then remove the bolt and use a tap to chase out the hole. Work fine about 95% of the time otherwise I have to insert a helicoil which is something I try to stay away from using.
Reply:Do you repair magnesium water pump housings for older Honda dirt bikes?  Mine looks like swiss cheese and I think the weight savings of magnesium have been negated by JB Weld.
Reply:The bit I have messes with cast aluminium 2 stroke parts, 5356 is not a good idea as the weld can fail once exposed to working engine temps. Liquid cooled is not likely as bad as air cooled.Lincoln PT185 TIGLincoln 175 MIGLincoln 240 amp AC StickLind Needle Arc plasma welderPlasma cutter, soon???
Reply:Originally Posted by 76GMC1500Do you repair magnesium water pump housings for older Honda dirt bikes?  Mine looks like swiss cheese and I think the weight savings of magnesium have been negated by JB Weld.