Lincoln "Wearshield" hardfacing rods

admin

Never used these before,and havin a heckuva time with em.   Doin a lot of "blobbing"   I know I'm doin somethin wrong....any ideas?
Reply:did you preheat? 300-500 degrees, allow to cool slowly? which polarity did you use? DC+ AC is optional.  don't believe that those rods are machinable you have to grind them or anneal the weld which brings the HRc to 30 then you can machine, single pass gives you 45-65 HRc I think and I believe a second pass gets you a little bit more. HRC = rockwell scale, which is basically the hardness of the material for machining,
Reply:No Mm,I didn't preheat.....I suspect tho I should have.
Reply:what are you hardfacing?
Reply:The MM(metal to metal) wearshield rods like to have base metal preheated, the other issue might be the rods got wet. but it doesnt seem like it. And what are you hardfacing?
Reply:Directional Drilling tooling....mostly backreamers...and a " railhead" rock bit
Reply:Is there going to be machining on the tooling? If so you may want to look into a different process to hardface. or maybe into a different weldment to achieve your desired result.What type of alloy are you trying to hardface? meaning what is it specifically made of, this will help to understand what process is the best. I am thinking that your application is going to deal with metal carbide with potential for some tungsten alloy in your tooling.
Reply:No Machining,and the work is done inthe Field,with the bare essentials as far as welding goes. Both Drillhead and backreamer are made for Cobble,or intermittent rock/shale etc.Not sure what the alloy makeup is,would prolly need to call the manufacturer,which hadn't occurred to me. It's just that I've never had this problem with any other hardfacing Rods i've used. i've done this type of thing a bazillion times on the same type tooling etc,and had good results with McKay,Stoody  etc rods.  The Lincoln Rods have sorta thrown me for a loop tho.
Reply:Okay, so this is not new just new rod, I know that the Lincoln rods need a preheat and to be cooled very slowly, since it is done in the field the other options are not really available, seeing they need a controlled environment. Is there a reason that you can't go with the Stoody rods? Have you checked out Lincoln's website to see what they have for your application? Which wearshield rod are you using?wearshield 44wearshield ABRwearshield MII think anyone of those would be best for your application.Last edited by mmchugh; 07-18-2010 at 10:37 AM.Reason: more information
Reply:The chemistry and specs for ABR are here;http://content.lincolnelectric.com/e...RSHIELDABR.pdfWith the graphite coating and 2% carbon with 6% chrome you're going to have a sluggish puddle and there will be lots of carbide formation with the chrome trying to get together with free carbon from the coating. Probably going to get a lumpy black looking bead.My guess is it is being used for a cost advantage.Also per mmchugh, which WEARSHIELD?MattLast edited by Matt_Maguire; 07-18-2010 at 10:54 AM.
Reply:Wearshield 60.Reason for not using Stoody is that the supplier was out of them,and I needed something right then. Don't have a clue as to the cost difference.And yeah Matt,lumpy and black so far LOL...but... it seems to be wearing as well or maybe a bit better than the stoody i was using....that is from what I can tell about the beads I've been able to get on there.   I tried the first on an old Drillhead we had for emergency backup....and it wasn't a  pretty sight!
Reply:Drill- Wearshield 60 is a better choice then some of the others. with the 60 there is no specific preheat or post heat needed, interpass temps should be limited to about 250 degree's C, limit to two layers, you can pre heat to 650 degrees C to eliminate the formation of check cracks.depending on current type, DC+ is recommended, and electrode size gives you an idea of current amp.If I remember correctly I believe the comparable product from stoody would be Stoody XHC 2134 or superchrome. And I think McKay Hardalloy 55.They are all very comparable, some difference between application of the weld, Lincoln likes a vertical weld technique although it can be done in the flat position. weaving is not recommended for this product rather use stringer beads. Stoody and McKay recommend weaving.Thats all I can tell you about the product. Good luck with your project.
Reply:Originally Posted by mmchughDrill- Wearshield 60 is a better choice then some of the others. with the 60 there is no specific preheat or post heat needed, interpass temps should be limited to about 250 degree's C, limit to two layers, you can pre heat to 650 degrees C to eliminate the formation of check cracks.depending on current type, DC+ is recommended, and electrode size gives you an idea of current amp.If I remember correctly I believe the comparable product from stoody would be Stoody XHC 2134 or superchrome. And I think McKay Hardalloy 55.They are all very comparable, some difference between application of the weld, Lincoln likes a vertical weld technique although it can be done in the flat position. weaving is not recommended for this product rather use stringer beads. Stoody and McKay recommend weaving.Thats all I can tell you about the product. Good luck with your project.