McKay Hardalloy 600

admin

can anyone tell me what this is best suited for, i cant find it listed on their website. its what we have to use for hardfacing and buildup of ground engaging tools at work, but i dont think thats what its designed for. its just not lasting. and also can anyone recommend something better. has to be a stick electrode, preferably McKay product.  mostly horizontal and vertical. ive researched the Hardalloy 140 and 155. but would like to know what works in the real world.  im trying to build an argument to take to my boss so we can get somethin better.
Reply:after doing repairs on dirt rigs over the years I've found that 7018 works just as well as anything out there. If I really felt the need for hard facing, like on grater plate, I'd do the repair with 7018 almost flush then cap it out with incolnel. If you use hardface to repair like a crack on a stress point you take the chance of a crack next to the weld. not because of lack of fusion but hard facing doesn't bend as easilly as the aparent metal.  revpol
Reply:oh thats all we weld with is 7018, and yes i like it, but some of our heavier wear items we use the hardface rod as the overlay, in diamond and circle patterns to hold materiel.  but its wearing off in 20 hours or less. weve started expierement wih kennametal and Caterpillar weld on wear bars, but in some areas such as the sides of our tiller drums side clearance is an issue. and i know theres no way in heck hes going to buy something like Inconel to do overlays with.  the weld up isnt so much for repairs but more to get more life out of the parts.
Reply:Dieselmudder,Call Hobart on Monday, 937-332-4000 and ask for Ivan or Chris Monroe.  Both can advise you on the best hardfacing rods for your application.  The best suited hardfacing will depend on the type of soil you're working in.  Clays, sandy soil, rocky soil, will all respond differently and the hardfacing alloys are designed to cope with different conditions.Rather than use 7018, which may be suitable, there are build-up electrodes that are designed for welding and serving as a foundation for hardfacing.  Depends on the type of base metal you're hardfacing....Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:thanks for the number and advice but my problem is that my boss is very narrow minded and would just shoot me down if i tried to tell him we need several different kinds of rod, for different situations.  plus our machines work all over the midwest, so i need something that will work "okay" in all situations. so i guess im searching for the mythical "universal perfect for everything" rod. if i was running the show i would put a lot more effort into it. but he makes the decisions and im just the guy on the end of the stick.  all i can do is make a simple suggestion and hope he goes with it.
Reply:Diesel,I checked my McKay reference when I got to work this morning...If you are looking for just a hardfacing electrode, then McKay hardalloy 140 or 155 will work just fine.  Both are designed for high abrasion and fair to low impact wear.  The 140 would be a better choice if you see any impact from large rocks in the soil.  The 140 will also develop a higher hardness with just one layer of hardfacing applied.  But 155 will reach a higher hardness if you take the time to apply a full 3 layers of hardfacing.  I'd guess that you're not likely to go this route....so I'd recommend the 140.Keep in mind that neither of these is a buildup filler metal.  you need to restore the underlying surface with an appropriate build-up rod.  IF you're already using 7018 for this, and not seeing any issues, I'm going to guess that your equipment is low carbon steel; not one of the high-manganese alloys used in some equipment.  There can be a big difference between low carbon steels and the high manganese alloys.  If you're not sure which you're dealing with, find out before you weld....If you need a compromise rod, for buildup, with some wear resistance, then Hardalloy 32 will work for low carbon steel applications.  You can make repairs and build up worn surfaces with 32, and still get some moderate improvement in wear resistance.  It also makes a good foundation for an overlay of Hardalloy 140.Both 140 and 155 will cross-check and neither has good machining properties.  Neither can be flame cut either, so keep this in mind.  IF you need to clean these up, you'll need a plasma cutter or a BIG grinder...Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:okay thank you, thats the information i needed.