الفهرس 
introductionOnly 14 pages are availabe for public view
 |  | from | 136 |  |  |
| | | from | 136 | | |
Abstract
from an economical point of view, abrasive wear as caused by Ploughing or gouging of a hard surface, hard particles or debris, against a relatively softer mating surface is the most serious cause of wear in the engineering practice. Achieving the maximum wear resistance at the lowest cost requires the consideration of many factors such as: cost of a new component, down-time for component replacement, cost of the surfacing material and service life after surfacing. In most cases, the resizing techniques are cheaper and easier to employ in practice than the complete overhaul of worn parts. Different resizing techniques such as : Submerged Arc Welding (SAW), Oxy-Acetylene Powder Spraying and Plasma Process are oftenly employed.
The objectives of this investigation is to study experimentally the effect of the SAW parameters on the wear resistance, hardness, adhesion strength and microstructure of the deposited layer on a low carbon steel shaft. These parameters include the rotational shaft speed, traveling speed, arc voltage and the welding current.
Variations of the electrical power were achieved by using stepped arc voltage of 24, 25 and 26 with stepped welding currents of 85, 95, 1O5, 115, 1E5 and 135 ampers. Other welding parameters were held constant throughout the experiments.
Specimens were prepared in the form of discs having 5 mm thickness each. Investigations of each of the abrasive wear, macro-hardness and shear tests as well as microstructure were performed for each of the welded specimens.
One of the important findings of this study was the revealing of tne considerable effect of the Welding Current on the chemical