43 Electrode

Combination of good toughness and crack resistance resulting from a dense matrix of a super work hardening austenite with spine-like crystals of chromium and titanium carbides. These extremely hard carbides provide resistance to gouging and high stress abrasion and the highly alloyed matrix provides resistance to low stress abrasion and scouring. The matrix is so tough that loss of carbides only occurs over a prolonged period of wear.

With some ordinary hard facing electrodes there is little or no protection against carbide precipitation in the transition zone. Often there is little or no control of penetration and there is a great deal of dilution of the weld metal into the base metal. This creates a heat affected zone at the interface of the deposit as a result of carbon migration and grain coarsening.

There is a tempering effect, which although brief, can often produce carbide precipitation and embrittlement in the areas heated to 400 to 700 degrees celsius, particularly in maintenance of steel parts which have been severely cold worked.

Worn parts have certainly received cold work and partical metallurgic transformation will have occurred in the surface layers. The heat input and uncontrolled deposit structure of ordinary hardsurfacing rods will carry this decomposition further.

Heat affected zone cracks are extremely dangerous, since they can result in the entire deposit spalling off. Longitudal cracks are of relatively frequent occurrence with some hardfacing electrodes. These cracks (true hot cracks) are also very dangerous since they cannot be closed up so readily by cold working as can transverse cracks (cooling cracks) which are also common.

43 provides a metallurgic advantage over most hard surfacing rods because the carbides that are formed are balanced and completely stable and occur uniformly throughout the deposit. The alloy has an even dispersement of carbides which gives uniform resistance to wear.

Some hardfacing electrodes that are based on carbide formation have non-uniform dispersement of carbides usually due to precipitation of elements and this allows premature wear in some areas and soon deterioration of the entire surfaced part breaks down.

43 employs special additives and stabilizers that control the carbides and eliminates carbide precipitation.

Special Features

• High deposition rate
• Deposits are smooth
• Hardness is 55 to 60 Rockwell C as applied
• Has shallow penetration which prevents dilution
• Easy application with no spatter, no pin holes, and easy slag removal

Application Procedure

Prepare base metal by cleaning and degreasing as far as possible. Sand or file weld areas to achieve a smooth working surface.

Either AC or DC reverse polarity welding machines may be used to apply 43. The electrode has a balanced arc transfer, a fast deposition rate and achieves neat smooth deposits free from spatter and porosity. It is very simple to apply and requires no special techniques or procedures.

When using 43 to overlay large areas, it is beneficial to make initial passes, build up with 30, and then make final three passes with 43.

For cast iron applications, optimum results will be achieved by making an all-over base coverage of 77 before applying 43.

Recommended Amperages

5/32" 120 to 140 amps

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