1. Describe the following weld defects with causes and remedies:
(b) Overlapping (c) Under cutting
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(a) Poor fusion
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III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 WELDING METALLURGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
[6+5+5]
2. (a) Write the advantages and limitations of TIG welding?
or
(b) Explain the application of TIG welding.
[10+6]
3. (a) Briefly describe different types of lasers.
(b) Describe the components of laser beam welding system.
[8+8]
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4. (a) Expalin the effect of gases which are absorbed during welding and give the prevention methods of gaseous contamination. (b) Define porosity in welds? Explain how to minimize porosity.
[8+8]
5. Write short notes on:
(a) Weldability of grey cast-iron
(b) Weldability of high carbon steels
[8+8]
nt
6. (a) What factors make aluminum alloys more difficult to weld than low carbon steels? (b) With neat sketches describe typical joint designs for arc welding of aluminum and its alloys? [8+8]
7. (a) What are the machine controlled variables in MIG welding process?
Aj
(b) What are the basic CO2 MIG welding processes? How do they differ? [8+8]
8. (a) What are the advantages of furnace brazing over other methods of brazing? (b) What are the furnaces used for brazing purposes? (c) Explain infrared brazing process? ?????
1
[6+5+5]
Code No: 35041
R05
Set No - 2
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 WELDING METALLURGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) List out any eight surface weld defects?
ld .
(b) Describe the effect of lack of fusion in butt, fillet and lap welded joints. [8+8] 2. (a) What are the fuel gases used in metal cutting? Give their advantages?
(b) What are the advantages and limitations of oxygen lance cutting over plasma cutting? [8+8]
or
3. What are the different non-destructive residual stress measurement methods? Explain the measuring of residual stresses in weldments using X-ray technique. [16] 4. With a neat sketch describe the principle of operation of any welding fixture with which you are acquainted and state the factors that must be considered for the effective operation of a welding fixture. [16]
uW
5. (a) Give the causes of porosity in the deposit, when hard facing is carried out on low carbon steel? (b) How does the welding of high carbon steels differ from that of medium and low carbon steels? Explain. [10+6] 6. (a) What are the properties required for brazing filler alloy? Name any four brazing filler alloys? (b) What are the functions of brazing fluxes? Name any four brazing fluxes? [8+8]
nt
7. (a) Explain how depth of penetration is accomplished with laser? (b) What are the most frequently used materials for laser production? (c) Why does not ordinary light perform in the same way as laser light? [6+5+5]
Aj
8. (a) Describe the process of welding dissimilar metals by fusion welding technique? (b) Describe the TIG welding of high strength Cu-Be alloys? ?????
2
[8+8]
Code No: 35041
R05
Set No - 3
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 WELDING METALLURGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. (a) Name different techniques used for welding of dissimilar metals? (b) What are the advantages and limitations of using resistance welding technique to make joints between dissimilar metals over fusion welding technique? [8+8] 2. Briefly explain the following welding residual stresses: (a) Mechanical residual stresses (b) Metallurgical residual stresses (c) Reaction stresses
[6+5+5]
or
3. (a) List out various radiant energy welding processes. (b) Explain the principle and operation of electron beam welding with a neat sketch. [4+12]
uW
4. (a) Define burning in the heat affected zone of a fillet weld and explain its causes and remedies? (b) Describe the phenomenon hydrogen induced cracking occurring in the welding of high strength steels. [8+8] 5. (a) What are the advantages of brazing over fusion welding? (b) Why is a flux needed in brazing? (c) What should be the basic flame adjustment for braze welding?
[6+5+5]
nt
6. (a) Explain the arc welding of cast iron with a neat sketch? (b) What are the detrimental effects which may be produced during making of a welded joint in 0.4% Carbon steel if the critical cooling is exceeded? [10+6]
Aj
7. (a) Explain how the welding arc be initiated without contact between electrode and parent metal in tungsten arc welding. (b) Draw a line diagram showing all the essential equipment for the above condition and label each part. [6+10] 8. (a) What are the advantages and disadvantages of submerged arc welding with two to three electrodes each having its independent power sources over that with single electrode? (b) What are the advantages and limitations of spray arc MIG welding process over pulsed arc process? [8+8] ????? 3
Code No: 35041
R05
Set No - 4
1. (a) What are the advantages and limitations of gas welding?
[8+8]
ld .
(b) Give the important applications of gas welding process?
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 WELDING METALLURGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
2. (a) How the welding characteristics of austenitic stainless steels differ from that of martensitic stainless steels? (b) Explain the welding characteristics of tool steels.
(a) Welding of dissimilar metals
or
3. Write short notes on:
(b) Welding of copper and its alloys.
[8+8]
[8+8]
4. (a) What are the requirements of a brazing flux? How it can be removed after brazing?
uW
(b) What are the advantages of brazing?
[8+8]
5. (a) What are the factors influencing weld joint design? (b) Describe the fillet weld and groove weld with neat sketches.
[8+8]
6. (a) What are the different phases which can be seen in the microstructures of weldment and heat affected zones of steel welds.
nt
(b) What are the phases encountered in the microstructure of grey cast iron welds? Explain. [8+8]
7. (a) Write short notes on focusing of laser light?
Aj
(b) What are the requirements to be fulfilled for a laser beam to perform fusion in a single phase? [8+8]
8. What is reheat cracking? What are the factors contributing for reheat cracking? How it can be avoided in steels? [16] ?????
(b) Describe the effect of lack of fusion in butt, fillet and lap welded joints. ... 8. (a) Describe the process of welding dissimilar metals by fusion welding technique?
(b) Fretting corrosion. [8+8] · 4. Explain vapor phase inhibitors. [16] · 5. (a) Discuss various corrosion rate expressions with their merits and demerits. (b) Iron is ...
6. (a) Explain the various functions and tables associated with Ring station and · Source routing group of RMON token ring. (b) Explain the different alarms and ...
where you are studying. Write CSS rule such that there are three different para- · graph styles p1, p2 and p3. p1 style must use left and right margins of 20 pixels, ...
heit (oF),converts in to an absolute temperature in kelvins · T(oK) = 5/9[t(oF)-32.0]+273. [16] · 6. Sketch an inverse Nyquist plot for a system with g(s) =.
(b) How fast can the output of an Op-amp change by 10V, if its slew rate is · 1V/µs? .... (b) Explain the application of 555 timer as Linear ramp generator. [8+8].
How can you find virus concentration both directly and indirectly by particle counts · and measurement of infectious unit concentration. Define plaque forming ...
(b) Explain with a neat block diagram the operation of a continuously variable .... (a) Draw the block diagram of band pass binary data transmission system and.
[16] · 4. A chemical process is represented by the following set of equations : f1(x3,x4)=0 · ; f2(x5,x2) =0 ; f3(x6) = 0 ; f4(x6,x1) = 0 ; f5(x3,x2) = 0 & f6 (x4,x5,x1) =0.
Explain. [8+8] · 2. Describe the different databases available for storage of protein resources. [16] ... acid sequence as query. The only reported match has an E ...
A steel bolt of 650 sq.mm C.S.A passes centrally through a copper tube of .... 6. A wagon of weight 25 k N, attached to a wire rope, is moving at speed of 4 km.
Explain in detail how transposable elements could be used to clone the genes. [16] · 7. Write in detail about ISSR molecular markers and its applications. [16].
(a) With a neat sketch explain the generation of action potentials. (b) List out different bio electric potentials. (c) Explain how bio electric potentials are measured.
(b) Break-Even Point in Rupees,. (c) Margin of Safety. (d) It is proposed to reduce the selling price by 20%. What extra units should be sold to obtain the same ...
(b) Explain briefly about the threat's to data integrity and confidentiality. [8+8] · 5. Describe different clinical applications of computers in nuclear medicine. [16].
(b) Evaluate. â. â«. 0 dx. (1+x2)2 using residue theorem. [8+8]. 8. (a) Evaluate using Cauchy's Integral Formula â«. C. (z+1) dz. (z3â4z) where C is |z + 2| = 3. 2.
Code No: 35051. R05. Set No - 2. 6. (a) Obtain the state-space representation of the system given by the transfer func- · tion. (Conanical form of state space model) · Y (S) · U(S) · = T (S) = · 1 · (S+1)(S+2)(S+3) · (b) A system is characterized by
[16] · 4. What are channel,circuit and half circuit in the context of satellite telemetry sys- .... 3. Describe the conditions for total internal reflection within a fibre. [16].
(b) Describe a DC Servo Motor with a neat sketch. [8+8] · 4. (a) What is a timing belt? Discuss the use of Timing belts in power transmission? (b) Discuss various ...
(b) Consider any two networks of your choice which support Circuit switching or ... (b) Which is more efficient, circuit switching or packet switching? Why?
(a) What is the difference between logical I/O and device I/O? (b) Explain feed back scheduling policy. [8+8] · 2. (a) How can logical address space be ...
kerosene, and fuel oil must be limited as also shown in this table. There are no ... equipment is a function of x, the size (horsepower ) of the motor, namely.
