cmdwelding,

Since you don't show an email address to sent this to, here is a little on the subject from what I have. You can copy and paste it on a word document:

METALS THAT CAN BE HARD SURFACED
a. All plain carbon steels with carbon content up to 0.50 percent can be hard surfaced by either the oxyacetylene or electric arc process.
b. High carbon steels containing more than 0.50 percent carbon can be hard surfaced by any of the arc welding processes. However, preheating to between 300 and 600°F (149 and 316°C) is usually advisable. This preheating will prevent cracking due to sudden heating of hardened parts. It will also prevent excessive hardening and cracking of the heat affected zone during cooling.
c. Low alloy steels can be hard surfaced in the same manner as plain carbon steels of the same hardenability if the steel is not in its hardened state. If it is in the hardened state, it should be annealed before welding. In some cases, heat treatment is required after welding.
d. The hard surfacing of high speed steels is not generally recommended. This is due to the fact that, regardless of heat treatment, brittleness and shrinkage cracks will develop in the base metal after hard surfacing. Usually there is no need for hard surfacing these steels because surfaced parts of low alloy steels should provide equal service characteristics.
e. Manganese (Hadfield) steels should be hard surfaced by the shielded metalarc process only, using the work hardening type of alloys or with alloys that will bond easily with this metal.
f. Stainless steels, including the high chrome and the 18-8 chrome-nickel steels, can be hard surfaced with most of the alloys that have suitable melting points. A knowledge of the composition of the stainless steel at hand is needed for the selection of the proper alloy. Otherwise, brittleness or impairment of corrosion resistance may result. The high coefficient of expansion of the 18-8 steels must also be considered.
g. Gray and alloy cast irons can be hard surfaced with the lower melting point alloys and the austenitic alloys. However, precautions need to be taken to prevent cracking of the cast iron during and after welding. Cobalt base alloys are also applicable to cast iron, although a flux may need to be applied to the cast iron.
h. White cast iron cannot be successfully surfaced because the welding heat materially alters the properties of the underlying metal.
i. Malleable iron can be surfaced in the same manner as cast iron.
j. Copper, brass, and bronze are difficult to surface with ferrous or high alloy nonferrous metals because of the low melting points. However, brass, bronze, and some nickel surfacing alloys can be applied very readily. Fluxes are usually need in these applications to secure sound welds.
ALLOYS USED FOR HARD SURFACING
a. General. No single hard surfacing material is suitable for all applications. Many types of hard surfacing alloys have been developed to meet the various requirements for hardness, toughness, shock and wear resistance, and other special qualities. These alloys are classified into six groups and are described below.
b. Group A. These include the low alloy types of surfacing alloys that are air hardened. Most of these electrodes are covered with coatings that supply alloying, deoxidizing, and arc stabilizing elements. Preheating of the base metal may be necessary to prevent cracking when harder types of electrodes are used, but in many applications the presence of small cracks is not important.
c. Group B. These electrodes include the medium alloy and medium-high alloy types. They have a light coating for arc stabilization only. The alloying agents are in the metal of the rod or wire. The electrodes in this group have a lower melting point than those in group A. They produce a flatter surface and must be used in the flat position only. Multilayer deposits, with proper preheat, should be free from cracks.
d. Group C. These electrodes include the high speed steel and austenitic steel alloys (other than austenitic manganese steels). The electrodes are either bare or have a light arc stabilizing coating. The bare electrodes should be only used for surfacing manganese steels because their arc characteristics are poor. To avoid embrittlement of the weld metal, the base metal must not be heated over 700°F (371°C). Peening is used in the application of these alloys to reduce stresses and to induce some hardness in the underlying layers.
e. Group D. These electrodes include the cobalt base alloys. They have a moderately heavy coating and are intended for manual welding only. To avoid impairment of metal properties, low welding heat is recommended. Deposits are subject to cracking but this can be prevented by preheating and slow cooling of the workpiece.
f. Group E. These alloys are supplied as tube rods containing granular tungsten carbide inside the tube. Their arc characteristics are poor but porosity and cracks are of little importance in the application for which they are intended. The tungsten carbide granules must not be melted or dissolved in the steel. For this reason, a minimum heat is recommended for welding. The deposits should show a considerable amount of undissolved cubicle particles.
g. Group F. These are nonferrous alloys of copper and nickel base types. They are heavily coated and are intended for direct current reverse polarity welding in the flat position only.
HARD SURFACING PROCEDURE
a. Preparation of Surface. The surface of the metal to be hard surfaced must be cleaned of all scale, rust, dirt, or other foreign substances by grinding, machining, or chipping. If these methods are not practicable, the surface may be prepared by filing, wire brushing, or sandblasting. The latter methods sometimes leave scale or other foreign matter which must be floated out during the surfacing operation. All edges of grooves, corners, or recesses must be well rounded to prevent overheating of the base metal.
b. Hard Surfacing with the Metal Arc. Surfacing by arc welding is done in the same manner and is similar in principle to joining by arc welding, except that the added metal has a composition that is not the same as that of the base metal. The characteristics of the added metal would be changed or impaired if it were excessively diluted by or blended with the base metal. For this reason, penetration into the base metal should be restricted by applying the surfacing metal with the minimum welding heat. In general, the current, voltage, polarity, and other conditions recommended by the manufacturer of the electrodes are based on this factor. An arc as long as possible will give the best results.
c. Hard Surfacing with the Carbon Arc. This process is used principally for the application of group F alloys. The welding machine is set for straight polarity and the heat of the arc is used to weld the particles of the base metal.