Carhart Customs LLC
kcarhart1@yahoo.com    (970)-560-5770

Hardfacing


Backed by over a decade of experience, Carhart Customs LLC has the skills and knowledge needed to extend the life of your equipment and replacement parts. We offer the best and most up-to-date hardfacing techniques available, regardless of what the application may be. Hardfacing restores elements of worn surfaces by applying new and improved material which in turn, increases product performance, extends useful working life, decreases equipment down time, and reduces replacement and repair costs.



Five steps to take when considering Hardfacing

  1. Identify the mode of wear
  2. Identify the base material
  3. Select the Product
  4. Select the process
  5. Select the thickness, diameter, and package

Processes

Oxy-fuel:
Oxy-fuel welding is a very precise welding process. Using Oxygen and Acetylene gas, base material is heated and filler-metal is "sweated" to item. Most of the time, filler metal consists of a filler-metal tub and flux center. I generally use a Tub Borium oxy-fuel rod. Advantages: Self sharpening, great for soil to metal ware, creates a serrated-like edge, great for adding carbon to base metal. Disadvantages: slower process. Uses:
 

  • Mower blades, sweeps, points, self sharpening
  • Bean Knives
  • Sub-soilers
  • Root-cutters       
 

Mig - Wirefeed:

Wirefeed welding offers a wide range of uses, most of the time this process is done in a shop setting because of the shielding gas used (can not have any kind of wind). There are several different filler-metals (wire) that can be used and this process does a great job when it comes to extensive buildup. Advantages: very cost effective, extremely fast welding and turn-around, offers lots of different hardness options. Disadvantages: Not as hard as other process, can't be done in a mobile or out-side climate. Uses:
 

  • Plow shares, land slides
  • Points
  • Concrete tool and equipment build-up
  • Bucket, tooth, and blade hardface
 

Powder Torch - Flame Spray:
Powder torch welding is truly one-of a kind welding. Granulated powder is fed through a special oxy-fuel torch, heated(molting hot) and "sweated" to base material. Advantages: Easy to machine, self sharpening, great for cast-iron, adds carbon to base metal, extremely hard. Disadvantages: More expensive, slower welding time, flaking, less build-up Uses:

  • Mower Blades, Sweeps, Points, anything that need to stay sharp or self sharpen
  • Shaft build-up
  • Sway Block build-up
  • Cast-iron hardfacing or build-up 
 
 
Arc - Stick:
Arc welding and arc hardfacing use an arc welding machine, either AC or DC powered, and "stick" electrodes to create a fusion weldment. The stick electrodes are coated in flux for maximum cleaning and weld-pool isolation from oxygen, nitrides, and other air contaminates. Arc welding is perfect for an outdoor or mobile situation. Advantages: High build-up, works well outdoors or in windy conditions, offers a wide range of stick electrodes for all applications. Disadvantages: Creates a large amount of smoke, single position (flat), slower process. Uses:

  • Ripper Teeth
  • Plow shares-land slides
  • Crusher Teeth
  • Shields and Deflector Shields
  • Points and metal-to-soil parts
  • Skid plates
 
   

Heat tempering:
 

 

  • Skid plates
    •     Blades
    •     Scraper Blades
    •     Bucket/Loader
    •     Bucket/Loader teeth
    •     Ripper teeth
  • Mower Blades
  • Shaft build-up 
  • Concrete tools and equipment
  • Deflector shields/ Gates
  • Rock crushing equipment
    • Crusher teeth
    • Hammer mill teeth
  • Sway Blocks
  • Equipment tracks (buildup, repair, and hardfacing)
  • Augers ***Auger rebuilding service available
  • Tillage
    •     Points
    •     Plow Shares, landslides, trash-boards
    •     Root-cutters
    •     Sub-soilers ***Ask about Sub-soiler modification, soil flow cut-outs, and other options
    •     Sweeps
    •     Ripper teeth
    •     Trash movers
    •     Shank padding
    •     Bean Kinves ***Must see the kinves before a quote is given

    

Pre and Post Heating:
    Post heating, other than cleanliness, is, by far, the most important step of hardfacing. If items are small enough they are placed in sand, floor-dry, or any other heat retaining material. Post-heating and the post-welding process can also be done with torches after items are hardfaced.  Sometimes, on larger items, Pre-heating is required. Most of the time this is done with the oxy-fuel torch, or a propane torch. This gets the base material up to about 600-800 degrees before any kind of welding takes place. It releases stress, and prepares material to be welded at temperatures of 1200-2200 degrees. Then, the slow cool process helps release stress factors slowly for the best possible product.    

   


Company disclaimer:
Hardfacing is an art, as with welding in general, there are an unbelievable amount of variables to take into consideration. Welding takes heat, heat releases stress. Some items that are hardfaced are formed items, welding/heat changes the base material and recreates stress within the piece. Cracking, flaking, shattering, and bending are all common product failures. Sometimes this happens no matter what precautions are taken. Carhart Customs LLC, takes every precaution possible to limit this problem, but sometimes it is unavoidable. Please ask about these problems when consulting.

 

 

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