Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
SHIELDED METAL ARC WELDING (SMAW)
It also known as Manual Metal Arc Welding (MMAW). The heat required for welding is generated by the electric arc formed between metallic electrode and base metal. When the welder touches the plate to be welded with the electrode, immediately a high starting current flows which melts the tip of the electrode, thus initiating the welding arc. If the welder maintains the arc gap, the arc continues to remain stable and the arc heat melts the plate, electrode and the flux coating. The flux covering of the electrode melts in the arc heat and produces a large volume of gases and the slag. The gases cover the arc and shield it from reacting with the atmospheric air. The slag covers the molten metal pool until it solidifies. The slag can be removed after welding. The flux also provides filler metal with alloying elements to increase the strength of the weld joint. The electrode is consumed in the arc during welding. In SMAW, the electrode polarity i s chosen depending on the manufacturers recommendation, which is printed on the cover of the electrode pocket.Shielded metal arc welding is the most common, versatile and least expensive one and accounts for nearly 25 % of total welding in developed countries and nearly 65 % of total welding in India. The electrode diameter varying from 1.6 mm to 6.3 mm and length varying from 250 mm to 450 mm. The power supply required for welding may be either a transformer or motor- generator or transformer - rectifier supplying AC or DC power. For achieving high quality welding, thyristor controlled or transistor controlled or inverter based power sources are employed. These latest solid state type of power sources is having feedback controls to deliver the controlled amount of voltage and current to the welding arc to achieve desired weld quality. The inverter power supplies are the latest technology and upto date power source. The main advantage of this power supply is the portability, lightweight and robust design. It can give required characteristics so that we can do SMAW, GTAW, GMAW, FCAW and gouging with the same power supply.
how is varignons theorem useful in engineering mechanics
Application of Cost-Volume-Profit Relationships: Quality stores open for 10 hours a day. Company is considering decreasing the store hours through one hour. This shall resul
design criteria for chain drives
Kinetics of a Particle: We have seen the effect of forces on a particle. The laws of motion for a particle are extended to include a system of particles or a rigid body. It is
Kinetics: Define Kinetics. What is plane motion? Sol: Kinetics is that branch of mechanics, which deals with force system that produces acceleration and resulting motio
Hi. I have made a payment for the above ticket number. Will I get all the workings out too? [email protected]
Risks associated with identified hazards can be reduced to a reasonable level through the application of good design principles that are focused on integrating safety into the over
GENERAL REASONS FOR DEFECTS The importance of weld quality is increasingly felt as we go ahead with the fabrication of sophisticated products using higher strength mater
Q. Show the Procedure of Compute flange stresses? Compute flange stresses and the actual bolt stress using: - COLT values for gasket seating stress, ‘y' and the gasket facto
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd