Hardfacing

The fusing process took place just when the paste melts and puddles and the base metal turned
red.

Can't say if the powder is still available.

I have a backhoe bucket pictured. I hope that is correct.

If you want to prevent wear from abrasion and are not concerned with impact, the best choice is tungsten carbide and the second best is vanadium carbide.

The weld metal should be applied with the least amount of penetration possible to avoid dilution. Tungsten carbide is applied as a one pass maximum so the carbides don't sink in the matrix and they must not be overheated as they will re-alloy into a softer material.

For surfacing the teeth, stringer beads deposited from side to side on the top surface will provide excellent wear characteristics. Use a large "X" pattern on the sides of the teeth to allow them to hold material. This causes material to wear against material as opposed to the tooth. Surfacing the bottom leads to a dull tooth.

The pattern for the bucket sides on the inside and outside surfaces is a checkerboard to again allow for material to build-up and protect the metal surface. On the front edge of the bucket sides where it cuts, stringer beads are run close together (Touching, the same as on the teeth.)vertically to protect the very front edge. Weld metal only needs to be deposited in the shiny areas. This should be similar to a triangle in appearance. No need to surface the entirety of the sides. HTH,
Steve
P.S. One of the books I have on our site, "Welding Technology" has a good section on hardfacing. There are some decent illustrations included.

I have some things that I need to hardsurface like the cutting edge of a loader bucket. Any info would be appreciated.

There are many types of weld metal chemistries designed for hardfacing. You mentioned carbides. There are several types of metals that carbides are derived from. Not all hardfacing or surfacing is done with carbides. It all depends on what caused the wear. The proper material for surfacing is chosen based on the cause or combinations of causes.

If your bucket is used for loose material, a pattern which protects the sides is in order as well as a pattern for sustaining the cutting edge and prolonging life of the entire assembly.

Most people replace severely worn edges these days due to the availablity of inexpensive replacement parts. Hardfacing is often a savings in the prevention of severe wear from the outset.
Steve

If the bucket has been hardsurfaced before or has splits then I would preheat 300 to 500 degrees then weld, then stress releive buy postheating 800 to 1300 degrees and cooling slowly by running the bucket into a pile of sand to cool.

Have fun!

T_Bone

T_Bone