Experimentation And Analysis Of Strength And Microstructural Parameters Of Mild Steel Specimen Hardf

Page 1

© JUL 2018 | IRE Journals | Volume 2 Issue 1 | ISSN: 2456-8880

Experimentation and Analysis of Strength and Microstructural Parameters of Mild Steel Specimen Hardfaced by Chromium Zedalloy-350 Using Shielded Metal Arc Welding (SMAW) Process. DIGAMBAR BENNE1, DR.DHANORANJAN CHOUDHARY2 1,2 Mechanical Engg. Dept. GNDEC BIDAR Karnataka, India Abstract -- In the present experimental study the hardfacing of mild steel components was done by the chromium alloy steel i.e ZEDALLOY-350 . using the shielded metal arc welding process by varying the welding process parameters like welding current, welding voltage and welding speed. The experimentation has been carried out by using Taguchi’s L9 orthogonal array and the output responses were noted down and investigation of strength parameters like hardness and impact strength was done along with microstructural study of hardfaced samples. Finally after the investigation it was concluded that the hardness and impact strength of the components was increased and the grainsize and phase distribution is also changes and which leads to high internal strength of the hardfaced components.

economy, and the hard facing material (which might be unsuitable as well as too costly for use in fabricating the complete part) selected to sustain wearing conditions to which the critical sections of the part will be subjected in service. Hard facing may be applied to a new part during its production, or it may be used to restore a worn-down surface. A large number of components such as balls and rollers of mill etc. are exposed to heavy wear and require efficient surface protection measures to avoid costly downtimes and to reduce costs for expensive spare parts. II.

Indexed Terms: Wear, Hardfacing, Shielded Metal Arc Welding (SMAW) etc.

I.

INTRODUCTION

Hardfacing or surfacing is a process of applying a metallic coating on the base metal with a harder metal to obtain certain specific properties like resistance to Impact loading, erosion and corrosion, abrasion, cavitations etc. Hardfacing, also known as “Hard surfacing”, is the process of build-in deposits of specialized alloys by means of a welding process to obtain specific advantages as mentioned above. Such an alloy may be deposited on the surface, an edge, or merely the point of a part subjected to wear. Welding deposits can functionalize surfaces and reclaim components extending their service life. This process has been adopted across many industries such as cement, mining, steel, petro-chemical, power, sugar cane food etc. A hardfaced part should be thought of as a composite, with the base material selected for strength and

IRE 1700709

EXPERIMENTAL PROGRAM

Control parameters of shielded metal arc welding process • • •

Welding current Welding voltage Welding speed

Selection of process parameters and their range Parameter And Range • • •

Current : 200-350 amps Voltage :30-50 volts Welding speed : 1.2-2.5 cm/s

III.

BASE METAL AND ITS CHEMICALCOMPOSITION

Mild steel: Mild steel is most commonly and widely used in engineering manufacturing sector. It is soft and highly ductile and therefore easily shaped in to any shape. It

ICONIC RESEARCH AND ENGINEERING JOURNALS

1


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.