Hardfacing over hardfacing

[liberty2701]

I have an excavator bucket that I would like to add some hardfacing over existing hardfacing. Can this be done without any special care other than preheating. I only have an ac stick welder so what hard facing rod would you recommend?

 

[RNeumann]

Cleaning is all that is needed typically. They make rods that are made specifically for hard facing.

 

[liberty2701]

I came across these rods.

Forney 4245 Supercote Hardfacing Welding Rod, 5/32-Inch, 5-Pound - Arc Welding Rods - Amazon.com

 

[yomax4]

You really need to know what's on there now. If it's manganese based then you will need to use manganese. If you don't, It will be easily knocked off. Also many hard surface applications call for only 2 passes of thickness. If you need more you will need to use a build up material. Sometimes 7018 will work for that but I prefer actual Stoody build up rod. it gives a type of cush effect to the bead. Good Luck.

 

[liberty2701]

How can I tell if it is manganese? Could I lay a bead over it and beat it with a maul to see if it stays. Would that work?

 

[RNeumann]

How To Weld: Hard-Surfacing with a Stick Welder - YouTube

 

[liberty2701]

I will watch. thanks

 

[hddnis]

Don't use the rods you linked to, not the best for dirt engaging because they are low impact resistant and only moderate abrasion resistance.

This should work, multi-pass and runs on AC.
Blue Demon Alloy 7 X 3/32" X 14" X 5LB pack general purpose hardfacing maintenance electrode - - Amazon.com

In your case exactly following number of layers, etc. is not critical. Lay a few beads on, your AC machine should work very well for this, stick hardfacing often works better with AC and lowest amps that will make it stick.

If the new beads break off then you have to change what you did or the rod you used.

You can put on a layer of 7018 and then do put hardfacing over that, it works sometimes, creates a "cushion" between the hard layers. I wouldn't do that unless you knew that just putting the hardfacing on doesn't work.

 

[liberty2701]

Good video. I will give those rods a try.

 

[mrmikey]

Low a heat as you can, you don't want to dilute the puddle any more than necessary and it doesn't have to be pretty. I've used Stoody 31, more of a general purpose hardface rod with good results, used them on loader, excavator buckets............Mike

 

[Lelandwelds]

Amazon! Who knew?

52 RC and 55RC is pretty darn soft. Stoody 31would be a good choice. I like Rankin. UTP 711B is great stuff if you are rich. E7018 is probably a poor choice for build up. Depending.

14.5 % manganese steel is non magnetic. If you run into a crusher jaw accidentally, keep it cool with wet rags while welding and it will not spall off. A grinder in a dark room will ID steels. Get a kit together of known steels to compare the unknown one to.

Preheating is not required on most things that need to be hardfaced.