Mechanical GATE 2017 Question No 23 Casting, Forming and Joining Processes - Principles of Welding, Brazing, Soldering and Adhesive Bonding

Question No. 23 Mechanical | GATE 2017

In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will

(A) increase by 25%
(B) increase by 50%
(C) reduce by 25%
(D) reduce by 50%

Answer : (D) reduce by 50%

GATE 2017 Mechanical Casting, Forming and Joining Processes Principles of Welding, Brazing, Soldering and Adhesive Bonding

Solution of Question No 23 of GATE 2017 Mechanical Paper

Heat given to weld pool $ ={\mathrm H}_\mathrm s=\frac{\mathrm V\vert{\mathrm\eta}_\mathrm h}{\mathrm\nu\;\mathrm A} $

$ \mathrm V= $ arc voltage

$ \mathrm I= $ current

$ {\mathrm\eta}_\mathrm h= $ heat transfer efficiency

$ \mathrm v= $ Velocity of welding (speed)

$ \mathrm A= $ Cross sectional area of weld.

$ {\mathrm v}_1=\mathrm v\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;{\mathrm A}_1=\mathrm A $

$ {\mathrm v}_1=2\;\mathrm v $

Now $ \mathrm{vA}=\frac{{\mathrm H}_2}{\mathrm V\vert{\mathrm\eta}_\mathrm h}= $ constant (RHS unchanged)

$ {\mathrm v}_1{\mathrm A}_1\;=\;{\mathrm v}_2{\mathrm A}_2 $ (Material deposition rate is constant)

$ {\mathrm A}_2\;=\;\frac{{\mathrm A}_1}2 $

Area of cross section reduced by 50%

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GATE Papers >> Mechanical >> 2017 >> Question No 23

Answer : (D) reduce by 50%

Questions of Principles of Welding, Brazing, Soldering and Adhesive Bonding

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