3) Why is friction stir welding known as"green technology"?OIt uses a green coloured toolO Due to its energy efficiency andenvironmental friendlinessO Due to its process efficiencyO It can be used to join dissimilar materials

Friction stir welding: The friction stir welding is a solid state joining process in which a…

Answered: 3) Why is friction stir welding known…

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter1: Introduction To Welding

Section: Chapter Questions

Problem 13R: How is a flux cored arc welding (FCAW) electrode wire different from a gas metal arc welding (GMAW)...

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4) The primary issue in fusion welding of material having high coefficient of thermal expansion is O High energy requirement Wider heat affected zone Type-IV cracking High residual stress and distortion
Answer by true (T) or false (F) for the folling sentences 1. Fusion welding means that the two surfaces to be joined and the filler metal are meling during welding and then solidifying in similar menner to local casting process. 2. In oxyacetylene welding process, the welding is done using oxidizing flame only. 3. Explusive welding process produces strong joints of dissimilar materials that are not weldable by are. 4. Hot working leads to eliminating the porosity in the metal and increasing the strength and hardness. 5. Work hardening is a characteristic induced in the processing part because of the heat treatment.
2) Which of the following is NOT true about friction stir welding? O It is a solid state process Fine grained structures can be obtained O It eliminates friction welding problems O It alters the chemical composition of the workpiece
1)a) Why is automation of the covered electrode arc source difficult?b) what properties is a metal with good resistance welding ability expected to have?c) Why is the heat transfer factor higher in arc welding processes with the consumed electrode than the methods used with the non-consumed electrode?d) Why is it important to weld thin and long instead of thick and short?e) why is it important that the source root is designed to be forced to press, not pull? 2) there is a characteristic liquid penetration error on a large piece of steel poured in the sand mold. The surface of the piece consists of a mixture of sand and metal.a) Explain at least 3 of the steps that can be taken to correct this error.b) what other types of casting errors may possibly occur in each of these steps? Explain 3) grain structure formed in part after casting;a) Describe by drawing a figure.b) what problems can this grain structure pose? Please explain. How can these problems be cured?4) explain two of the…
10)Which of the followings is true for LASER welding process? O It is a high heat input process O High reflectivity materials can be welded easily OA close control over process parameters is required for proper welding OVacuum conditions are required
8) The electro-gas welding is different from electro-slag welding because in electro-gas welding Copper shoes are not used Heat is generated by electric arc Electrode used is of non-consumable type O Only thin sheets can be welded
» A Moving to another question will save this response. uèstion 18 In 'reverse polarity' of arc welding O A Electrode is connected to + and most of the heat is generated at the electrode O B. Electrode is connected to - and most of the heat is generated at the workpiece O C. Work piece is connected to + and most of the heat is generated at the workpiece O D. Work piece/is connected to-jandimost of the heat is generated at the workpiece Windows buau licyl Jäil e IT:ET T-T/-E//V ENG 4) %2:
Discuss in details different type of resistance welding with the help of best diagram
Which one of the following is not a fusion welding process? (a) Gas welding (b) Arc welding (c) Brazing (d) Resistance welding
What are the parameters of inert gas welding process?
a) explain the principles of Gas Metal Arc Welding (GMAW) b) explain three (3) modes of metal transfer for GMAW
8) The correct ways to control liquation cracking tendency in fusion weld joint are I. Use of filler metal that solidifies before the partially melted zone I. Use of single pass welding with higher net heat input instead of multipass welding III. Use of high energy density processes IV. Preheating the substrates V. Use of base metals with fine grain structure OI, II, and III II, and IV OII, IV, and V O II, III and IV

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