Module: 4 and 5
Quiz Short questions:
1. The requirements of _________, ___________ and _______________
demand the use of advanced or non-conventional welding methods.
2. In the SAW process, the arc is _____________ under a blanket of _________,
hence it is not visible from outside.
3. The flux helps in removal of impurities in the form of _____ and can improve
the properties of weld by addition of ______________.
4. SAW gives higher ______, ______ and _____ as compared to other welding
methods.
5. The polarity of DCEN (Direct Current Electrode Negative) gives
____________, _____________ and ______________.
6. The resistance welding uses ____________ to generate heat, which is a
_______.
7. The heat generated in RW is given by
__________________________________.
8. Some examples of variant resistance welding processes are
________________
9. Explosive welding is primarily used for bonding sheets of corrosion- resistant
metal to ____________________________, particularly for
_______________
10. The prime limitation of explosive welding is that
_________________________
11. The Friction Welding (FRW) is a __________________ process that produces
a weld under _________________.
12. The principle of FSW is due to
________________________________________
13. The electron beam welding process is mostly used in joining refractive
materials such as _____________; which are used in missiles.
14. In Laser welding, the heat input is localized, coherent and just sufficient to
fuse the weld metal, thus the _______________________________.
15. The diffusion welding can be achieved when
____________________________.
16. HERF processes utilize the
__________________________________________.
17. The rapid prototyping systems use an: ____________ in building shapes and
join __________________________ to form physical objects.
18. The SLS stands for _______________________ which can selectively
manufacture models having ____________ using laser and CAD technology.
19. Microwave processing is a ___________ process enabling ___________
processing of materials.
20. Power absorbed in microwave processing is given as: __________________
21. In microwave processing, as the energy is absorbed within the material, the
electric field ________________________________.
22. In microwave processing, the heat is generated is
_______________________, instead of originating from external sources.
23. The recent applications of microwaves include
_________________________.
24. The most promising future technologies in advanced manufacturing include
________________ and _____________________
Answers
1. Good finish, low heat affected zones and high quality welds
2. Submerged, flux
3. Slag, some alloying elements
4. Metal deposition rates, welding speeds and process efficiency.
5. Higher deposition rates, higher yield strength and higher hardness
6. Electric current, renewable and environment friendly resource
7. H= K I2 RT
8. Upset, Spot, Projection and Seam welding.
9. Heavier plates of base metal (cladding), large areas.
10. Metals must have high impact resistance and ductility.
11. Solid state welding, compressive forces
12. Friction heating at the interface under pressure.
13. Columbium, tungsten and ceramics.
14. Heat affected zones are reduced and work piece distortions are minimized.
15. Two pieces are in intimate contact under pressure.
16. Application of large amounts of energy in a very short time interval
17. Additive approach; liquid, powder, or sheet materials
18. Selective Laser Sintering, cavities.
19. Green, rapid
20. P = 2πƒε״E2
21. Decreases as a function of the distance from the surface of the material
22. Internally within the material and transmits outwards
23. Sintering, joining, cladding and drilling of materials.
24. Rapid Manufacturing and Microwave processing.
