military markets have relied on prepregs. Prepregs enable manufacturers to closely control resin-to-fiber ratios. Prepregs require less cleanup and waste (no over spray). Q23: ULTRASONIC WELDING? ULTRASONIC WELDING: Vibrations move parts at a minimum of 20,000 hertz, causing friction that melts metal and plastic parts. Ultrasonic can be used to spot weld, change adhesives to molten material, and melt films and fabrics together. Used for sealing and staking—melting thermoplastic studs to mechanically
Abstract: Scramjet propulsion generates huge amount of aerodynamic heat loads on engine structure thereby posing a problem of its cooling during the flight of hypersonic missile. Regenerative cooling using hydrocarbon fuel seems to be a solution which uses both physical heat sink and possible chemical heat sink of the fuel. A test setup was designed and constructed for carrying out the experiments to find out the suitable endothermic fuel. Experiments are carried out at high temperatures and pressures
are arc voltage (arc length), welding current, travel speed, and shielding gas. The amount of energy produced by the arc is proportional to the current and voltage. The amount transferred per unit length of weld is inversely proportional to the travel speed. The arc in helium (He) is more penetrating than that in argon (Ar). However, because all of these variables interact strongly, it is impossible to treat them as truly independent variables when establishing welding procedures for fabricating specific
INTRODUCTION IS 800 -2007 is based on limit state method whereas IS 800 -1984 is based working stress method. The acceptable limit for the safety and service ability requirements before failure is limit state .The objective of limit state design is to achieve a structure that will not become unfit for use with an acceptable reliability
activity during some hours of normal operation on pure gas. However, gross poisoning leads to bulk changes which are not readily reversed: in this case the poisoning is irreversible. Poisoned catalyst can hardly be regenerated, and therefore the best method to reduce poisoning is to decrease to acceptable levels the poison content of the feed. This is generally achieved by appropriate treatments of the feed by catalytic hydrodesulphurization followed by H2S
the dash of a button. For years during the entire period of third industrial revolution subtractive manufacturing has been used to create prototypes and small parts. The old way of creating things consisted of taking lots of parts and bolting or welding them together which was very tedious and time consuming. Today it is possible to design and print a product with the help of 3D printer, which creates a solid object by constructing up consecutive layers of
surfaces if the pattern to facilitates removal from the die. Making a pattern using wax or some other material that can be melted away makes the mould. Pattern may be made in loose pieces and then welded together by means of the hot wire resistance welding iron to form the complete pattern. The numbers of patterns are welded together along with the common gating system. 1.2 CLASSIFICATION OF RAPID PROTOTYPING TECHNOLOGY. Technological advancement and globalisation resulted in increased competition
Thermography The source “Infrared Thermography” discusses that a method to determine the heat dispersion in substances under observation, and also used to find out its time dependency is called thermography, it is also called thermal imaging. The purpose of this method is to change an infrared picture into a visible picture. The main function of thermography is to generate a visible picture with an illuminated dispersion and it is corresponding to the infrared illuminated dispersion of the substances
DIPLOMA PROJECT THEME FOR: Viviana Elena Sînziana DINU 1. Theme title: 3D Printed Robotic Hand Driven by Sensor Glove and Leap Motion 2. Initial design data: The robot hand must imitate the movements of a human hand fit into the glove that has motion sensors. The robot hand will have 5 motors, one for each finger of the hand. The motors will be controlled by a microcontroller. The glove must have 5 motion sensors that read the movement of the human hand that wears the glove, sending the data
are like aluminium, magnesium, titanium, copper alloys, refractory metals, noble metals, super alloys are used. Alloys are primarily distinguished based on cast and wrought alloys. Cast alloys are brittle. So, deformation is not possible by various methods. On the other hand, wrought alloys are ductile and are deformable. Types of alloys: 1.Copper and it’s alloys: Pure copper which is also unalloyed copper is very soft and ductile. Copper is less resistive to corrosion. It reacts