Welding a Rail Joint: Gas pressure welding, Electric arc or metal arc welding, Flash butt welding, Thermit welding

Welding a Rail Joint The purpose of welding is to join rail ends together by the application of heat and thus eliminate the evil effects of rail joints. There are four welding methods used on railways. (a) Gas pressure welding (b) Electric arc or metal arc welding (c) Flash butt welding (d) Thermit welding The detailed descriptions … Read more

RAIL SPECIFICATIONS AND RAIL CORROSION: RAIL SPECIFICATION, Rail Sections, Iron from Iron Ore, Structures of Steel, CHEMICAL COMPOSITION OF RAIL STEELS, MECHANICAL PROPERTIES OF RAIL STEELS, MARKING ON RAIL and Stresses in Rail

RAIL SPECIFICATIONS AND RAIL CORROSION Grade C Mn Si S (Max.) P (Max.) Al (Max.) Others (Max) Hydrogen Content in Liq Steel (Max.) 880 0.60-0.80 0.80-1.30 0.10-0.50 0.030 0.030 0.015 — 1.6 ppm 1080 Cr 0.60-0.80 0.80-1.20 0.50-1.10 0.025 0.025 0.004 0.20 Mo+ .8-1.2 Cr+ .2V 1.6 ppm 1080 HH 0.60-0.80 0.80-1.30 0.10-0.50 0.030 0.030 … Read more

Difference between Gas Welding and Arc Welding

Difference between Gas Welding and Arc Welding Gas Welding 1. Heat is produced by the Gas Flame 2. The flame temperature is about 3200 Degree Celsius  3. Separate Filler rod introduced 4. Suggested for thin materials  5. Gas welded parts do not have much strength 6. Filler metal may not be the same parent metal 7. Brazing and soldering are done using … Read more

Precautions During Thermit Welding

Precautions During Thermit Welding In order to ensure the quality of thermit welded joints, the following precautions should be taken.  Follow prescribed procedure  Thermit welding of joints should be carried out strictly as per the prescribed norms. The horizontal and vertical alignment of two rail ends require special attention at the joint. In particular, case should be taken … Read more

Types of Rail Joints: Classification According to Position of Sleepers, Classification Based on the Position of the Joint

Types of Rail Joints The nomenclature of rail joints depends upon the position of the sleepers or the joints. Classification According to Position of Sleepers Three types of rail joints, come under this category. Supported joint  In this type of joint, the ends of the rails are supported directly on the sleeper. It was expected that supporting … Read more

Rail Joints: Effects of a Rail Joint

Rail Joints Although a rail joint has always been an integral part of the railway track, it is looked upon as a necessary evil because of the various problems that it presents. Earlier, rails were rolled in short lengths due to difficulties in rolling and the problem of transportation. With increase in temperature, rails expand and this … Read more

Requirements of an Ideal Rail Joint

Requirements of an Ideal Rail Joint The ideal rail joint is one that provides the same strength and stiffness as the parent rail. The characteristics of an ideal rail joint are briefly summarized here.  Holding the rail ends  An ideal rail joint should hold both the rail ends in their precise location in the horizontal as well … Read more

RECIPROCATING PUMP TEST RIG

RECIPROCATING PUMP TEST RIG Introduction In general, a pump may be defined as mechanical device when connected in a pipe line, can convert the mechanical energy into hydraulic energy, thus resulting in the flow of liquid from lower potential to higher potential. Pumps are of major concern to most engineers and technicians. The types of pumps vary … Read more

ORIFICE METER TEST RIG

ORIFICE METER TEST RIG An ORIFICE METER is a simple device used for measuring the discharge through pipes. The basic principle on which an Orifice meter works is that by reducing the cross – sectional area of the flow passage, a pressure difference between the two sections before and after Orifice is developed and the measure of … Read more

S.I. Units (International System of Units): Fundamental and supplementary units, Mass and Weight, Inertia, Laws of Motion, Newton’s First Law of Motion, Newton’s Second Law of Motion, Newton’s Third Law of Motion, Force, Moment of Force

S.I. Units (International System of Units) The 11th General Conference* of Weights and Measures have recommended a unified and systematically constituted system of fundamental and derived units for international use. This system is now being used in many countries. In India, the standards of Weights and Measures Act 1956 (vide which we switched over to … Read more