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Enrolment No.
Subject Name: Advances in Welding Metallurgy
Time: 10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q1 (a) State the requirement of advances in welding Power sources giving suitable examples. [03 MARKS]
(b) Enlist Process variables of GTAW process and discuss Why high frequency arc starting is required in GTAW Welding? [04 MARKS]
Q.2 (a) Draw schematics comparing DCEN, DCEP and AC welding characteristics with 1. Heat balance 2. Penetration characteristics 3. Oxide cleaning action and 4. Electrode size and current caring capacity. [07 MARKS]
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(b) Calculate heat Input for SMAW Process Current- 150 A, Voltage- 22 V, Travelling Speed- 150 mm/min, process efficiency 60%. [03 MARKS]
(c) Critically Compare Argon, Helium Argon-helium mixtures and CO2 shielding gases. [04 MARKS]
Q3 (a) Justify the following development with filler Wire/Consumable a) Addition of Fe Powder in SAW Flux b) Rutile based Flux coating in SMAW Electrodes c) Titanium Boron micro alloying in SAW Wire d) Low hydrogen electrodes: [07 MARKS]
(b) Explain Specifications of following Consumables : - (1) E6013 (2) F70A2-EL8 (SAW FLUX + WIRE) (3) ER 70 -S6 /ER 70-S2 (4) E71T - 1 [03 MARKS]
Q4 (a) Classify the Low hydrogen electrodes and state their requirements. [04 MARKS]
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(b) Enlist the various parameters of Friction Stir Welding and state the merits-demerits and application. [07 MARKS]
(c) Draw schematic of various modes of metal transfers in GMAW. [03 MARKS]
Q5 (a) Evaluate Flux core wire gives higher penetration compared to solid wire. [04 MARKS]
(b) Draw schematic of plasma key hole welding and state the applications of this process. [07 MARKS]
(c) Differentiate between agglomerated and fused fluxes used for SAW Process. [04 MARKS]
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Q.6 (a) What are the benefits of Pulse TIG welding technology? Only draw pulse wave form. [03 MARKS]
(b) Why Ac welding is preferred for welding of Aluminium /aluminium alloys ? [04 MARKS]
(c) Explain the process of Activated Flux TIG Process & state the merits & demerits. How much plate thickness it can weld in one pass? [07 MARKS]
Q7 (a) Draw schematics of Hot Wire TIG Welding Process the state the benefits of this process. [03 MARKS]
(b) Low heat input and less weld metal volume is preferred to obtain sound mechanical properties of the weld? Justify with suitable example [04 MARKS]
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(c) What is Cold Metal Transfer Technology? What are the process benefits of this process? [07 MARKS]
Q.8 (a) Enlist Salient features of intelligent welding Power source system based on Fuzzy logic and Artificial intelligence. [03 MARKS]
(b) Differentiate between self-shielded and externally shielded electrodes. [04 MARKS]
(c) Write short note on (i) Robots in Welding automation (ii) Modelling and simulation of welds [07 MARKS]
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