The geometry of the strip electrode used in the process of submerged arc hardfacing of continuous casting rolls
Journal: Reporter of the Priazovskyi State Technical University. Section: Technical sciences (Vol.29, No. 1)Publication Date: 2014-12-04
Authors : L.K. Leshchinskiy; V.N. Matviyenko;
Page : 123-127
Keywords : continuous casting rolls; submerged arc hardfacing; strip electrode; base metal; penetration; non-uniformity; dilution; weld shape; chromium content;
Abstract
The results of the investigation of the influence of the size of the strip electrode on the dilution of the base metal used in the process of submerged arc hardfacing of continuous casting rolls are presented. Increasing the thickness and decreasing the width of the strip electrode (60?0,5 mm, 45?0,7 mm, 30?1,0 mm) results in the changing of the shape and dimensions of the fusion zone of the base metal to enhance the depth and reduce the non-uniformity of fusion penetration. The experimental data show that the dilution ratio of the base metal using the strip electrode 45?0,7 mm, containing 13,5 % chromium, made it possible to obtain more than 11 % chromium in the chemical composition of the third deposited layer. In the process of submerged arc hardfacing increasing the travel speed of the strip electrode (heat source) up to 12 m/hour enhance the dilution ratio of the base metal. Despite this, the chromium content of the third layer is not less than 11 %. At the same time, the improved parameters of the hardfacing process allowed to achieve the better weld shape and to reduce the number of welding defects. When deposited on continuous casting rolls, the chemical composition of the deposited metal insures the corrosion resistance of the rolls and increases their longevity
Other Latest Articles
- Intensification of the electro slag process exothermic mixtures (fluxеs)
- Heat balance of the rotary kiln for the limestone burning and its analysis
- Influence of the velocity mode upon alternations in ingot’s stressed state
- Investigation of the effect of heat treatment on the structure of the cold-rolled ferrite stainless steels
- Selecting the thermo-cyclic treatment’s optimum parameters based analysis of fractal surfaces indicators
Last modified: 2015-07-23 19:05:53