Abstract
1. A study was made of the following processing parameters of gas-powder weld-facing with boron carbide: powder particle size; layer thickness and depth of fusion; effect of the shape of the part being faced on deposit quality; weld-deposition rate; time necessary for the preheating of the part. 2. Boron carbide powder fractions Nos. 10–16 were found to be the most suitable for gas-powder weld-deposition. 3. In the weld-deposition of boron carbide, layers more than 1 mm thick are difficult to obtain. Where layer thicknesses of 1–2 mm or more are required, it is necessary to employ carbide-iron weldfacing mixtures containing 50–75 wt.% B4C. 4. An empirical equation has been derived for the coating thickness obtainable in gas-powder weldfacing with pure boron carbide and boron carbide-iron mixtures, which allows for the depth of fusion as a function of the B4C content of the powder mixtures. 5. The process is particularly well suited for the deposition of coatings on flat surfaces of parts of small weight. On oval-shaped parts, coatings 1 mm thick can be deposited at diameters of more than 60 mm. Coatings 0.4–0.6 mm thick can be applied to both small- and large-diameter parts.
Published Version
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