Home » Materials Science and Manufacturing Engineering » Materials Science and Manufacturing Engineering Miscellaneous » Question

Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering

  1. Two 8 mm thick steel plates are placed 5 mm apart and welded by a butt joint. Welding is carried out at 20 V and speed of 5 mm/s. Heat transfer efficiency is 0.80. If the heat required to melt steel is 10 J/mm3 and melting efficiency is 0.625. The weld current (in amperes) will be
    1. 100
    2. 200
    3. 300
    4. 400
Correct Option: B

t = 8 mm, Gap = 5mm
V = 20 volts, v = 5 mm/s
ηHt = 0.8, H = 10J/mm, ηm = 0.625
I =?
Volume of weld pool = 8 × 5 × x
= 40 x mm3
Heat Required = 10 × 40 x = 400 x J
Heat Generated

= ηHtηm
VIx
v

= 400=
0.625 × 20 × I × x × 0.8
5

I = 200 A



Your comments will be displayed only after manual approval.