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Answer: Solid state welding
Explanation: Solid state welding is the welding procedure which is based on the temperatures and pressure but without any liquid or vapor as aid for welding.This process is carried mainly cohesive forces and considering forces as less important. Brazing,soldering and adhesive is the process in which material are joint which the help of solid welding agent.Thus solid state welding is the correct option.
Answer:
The time required is 10.078 hours or 605 min
Explanation:
The formula to apply here is ;
K=(d²-d²₀ )/t
where t is time in hours
d is grain diameter to be achieved after heating in mm
d₀ is the grain diameter before heating in mm
Given
d=5.5 × 10^-2 mm
d₀=2.4 × 10^-2 mm
t₁= 500 min = 500/60 =25/3 hrs
t₂=?
n=2.2
First find K
K=(d²-d²₀ )/t₁
K={ (5.1 × 10^-2 mm)²-(2.4 × 10−2 mm)² }/ 25/3
K=(0.051²-0.024²) ÷25/2
K=0.000243 mm²/h
Re-arrange equation for K ,to get the equation for d as;
d=√(d₀²+ Kt) where now t=t₂
![d=\sqrt{0.024^2+0.000243*t} \\\\0.055=\sqrt{0.024^2+0.000243t} \\\\0.055^2=0.024^2+0.000243t\\\\0.055^2-0.024^2=0.000243t\\\\0.002449=0.000243t\\\\0.002449/0.000243=t\\\\10.078=t\\\\t=605min](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B0.024%5E2%2B0.000243%2At%7D%20%5C%5C%5C%5C0.055%3D%5Csqrt%7B0.024%5E2%2B0.000243t%7D%20%5C%5C%5C%5C0.055%5E2%3D0.024%5E2%2B0.000243t%5C%5C%5C%5C0.055%5E2-0.024%5E2%3D0.000243t%5C%5C%5C%5C0.002449%3D0.000243t%5C%5C%5C%5C0.002449%2F0.000243%3Dt%5C%5C%5C%5C10.078%3Dt%5C%5C%5C%5Ct%3D605min)