What welding rod?

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Making a repair on an asphalt plant on the mixing drum . This runs at 700+deg this pice has been repaired twice with 7018 welds crack rite down the center . The factory welds did also the heat in this machine can make grade 8 bolts pop there heads off in a few weeks . I think the heat hardening is what is breaking the welds any and all opinions welcome.is there a better rod?
Reply:If it was my repair id try some 309 stainless steel rods. I have welded coil springs and it's held. Built some hi temp ducting  over 700 deg operating temp with heat cycles and used 309 and inconel rods. Give it a try. Maybe with some pre heat to 300.
Reply:You got a picture of the part/weldement?
Reply:Now here is an interesting welding problem...And no i has no idea and i have not heard of this beforeBut i would like to learn the answerBacked my CATMA over your CARMA oops clusmy me  What would SATAN do ?? Miller Trailblazer 302 AirPakMiller Digital Elite  Optrel Welding HatArcair K4000Suitcase 12RC / 12 VSHypertherm PM-45Rage 3 sawRusty old Truck
Reply:With a tapered punch attachment in it use an air hammer and peen every pass so you can't see the ripples in it. This will relieve the stress created by the weld. I used this technique welding cracks in manganese rock crusher wear metal 2" thick and it always worked for me.                                                            MikeLast edited by mla2ofus; 10-06-2014 at 11:35 PM.Ol' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:700 isn't that much heat, reallyVibration, plates moving when the machine is moving,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,  ,,,,,,,,,,,,Look at the machine before you look at the welds.  The failure might just be something that's totally unrelated to the weld.  Sum of the Parts sorta thing.You may have to isolate the weld from vibration before it will be able to hold, or the weld is subject to too much stress due to the design..........."Any day above ground is a good day"http://www.farmersamm.com/
Reply:Everybody always looks to the weld for the failure, it might just be the machine is causing the weld to fail"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Originally Posted by farmersammEverybody always looks to the weld for the failure, it might just be the machine is causing the weld to fail
Reply:Welds I could see failing due to the base material simply being fatigued and at the end of it's service life. But if the machine is now shearing good quality grade 8 bolts, and didn't before, that tends to point towards another issue now causing problems..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:I would like to see a pic too. It sure seems odd that it cracked in the center of the weld.Normally all the ones I have seen crack along side of the weld .
Reply:Ive encounted a similar ptoblem before welding fin tube in a power station boiler, the problem turned out to be the metal being restained and not being able to shink after welding, i got around it by pre heating a large area around the weld to 200 centigrade ( i guess about 450f?), perhaps alsp try a more ductile rod such as 6013.Sent from my LG-P716 using Tapatalk
Reply:I don't have away to post photos   Dsw  the bolt thing is in general on the hot plant      We grind everything pre and post heated to 400 welded with esab 8018 . The plan is if welds will hold the problem will show its self in time . I have thought about a more malleable rod I have never ran much 6013 .i do know grade 5 bolts outlast grade 8 on this machine maybe 6013 would act that way
Reply:Originally Posted by ttoksIve encounted a similar ptoblem before welding fin tube in a power station boiler, the problem turned out to be the metal being restained and not being able to shink after welding, i got around it by pre heating a large area around the weld to 200 centigrade ( i guess about 450f?), perhaps alsp try a more ductile rod such as 6013.Sent from my LG-P716 using Tapatalk
Reply:Originally Posted by MinnesotaDave  6013 is not rated to be more ductile than 7018.
Reply:Originally Posted by AKweldshopI got you now!!!
Reply:Thanks for the input guys it's repaired for now.  I bet I haven't ran two pounds of 6013 in my life lots of 6010, 70,80,10018 .if it will hold for a couple of weeks the paving season will be over and hopefully the winter maintenance will find the root of problem.
Reply:Skyline let me give you a few things to think about until you go back for your next repair.Sometimes electrodes are thought of as majic wands.Last edited by Excalibur; 10-09-2014 at 03:58 PM.Lincoln Electric:Ranger GXT 250SA-200LN-25Pro MiG 256Pro Mig 180Esab CV 251Invertec 160Victor Torches”
Reply:Originally Posted by MinnesotaDaveIn this AWS chart, 6013 is not rated to be more ductile than 7018.
Reply:Originally Posted by BaTuThat's a Very Interesting Chart... I'm having trouble deciphering the 2 Current rows though. What's with the 2nd line being opposite of the one above it? (DC goes AC etc.)
Reply:Yes, of course I see now...I love the category Welder appeal, this has to have been made some time ago
Reply:Originally Posted by ExcaliburSkyline let me give you a few things to think about until you go back for your next repair.Sometimes electrodes are thought of as majic wands.
Reply:Anywhere hydrocarbons have been, hydrogen cracking is going to be an issue. Especially asphalt, you try and grind it off, and it just spreads residue back over the new metal, its just nearly imposible to get it clean. If there any near the weld, it just seems to seep in.Constant Current Weldor.