Mechanical Engineering is the Best Branch of Engineering (LOL its selfish decision bcz i am in Mechanical Engineering) . I fight many viva s and Interviews then i realise . There are some related questions that are frequently asked to me in all viva;s and some of them are not leave me from 1st sem to 8th sem.
Here some of them are very wide subjects so that you can done your M.Tech in one topic : like Welding. but here i will give you a short answer & if you want a wide descriptive answer then you can request us .
So here are some questions Related to Brazing that are frequently asked in all vivas and technical interviews . So all of You Mechanical Engineers should know Answer of these Frequently asked questions of Mechanical Branch.
Q1 – different between welding , soldering and brazing ?
Found It Your-Self or I will give you a Next link on this topic , Because its important to know a right Answer.
Q2 – How Brazing works ?
Brazing creates a metallurgical bond bw the filler metal and the surfaces being joined. Heat is applied to the base metals and the filler metal is brought into contact with the heated parts. When filler material get melts , it drawn through the joint by capillary action.
Q3 – What is provided by brazed joint ?
- It can Easily join dissimilar metals
- Strong Joints
- It doesn’t melt base metal
- It Provide good Joint Appearance
- Lower temperature / Lower Cost
Q4- What do you mean by Oxidation ?
When Oxygen comes in Contact with a metal , It makes oxides from oxygen and these oxides attached to metal which prevent metal to joining on Metallurgical level.
Q5 – What is Flux ?
Flux is a chemical compound that protect and shields the joint surface from air and prevents oxidation of metal .The metals that are being joined should be cleaned to flux will dissolve & absorb oxides .
Q6- What is Brazing Flux , Why it used ?
Brazing Flux is a material consisting of metal alloy in a powdered form mixed with a binder material . It’s Optional &It is added to the brazing paste ( If required ) to provide protection from oxidation .
Q7- Flux can be thinned?
Yes , Water can be use to thin water base fluxes. Generally Distilled water Or De-Ionised Water is used to thinning the fluxes , when needed.
Q8- Can stainless steel be brazed in vacuum below a temperature of 1700° F?
No , Stainless can’t be vacuumed brazed in at a temp below the 1700° F bcz of the possibility of “chrome oxide” formation ,that will prohibit the flow of the filler metal alloy on the stainless steel.
Q9- What is Standard temp of furnace be to furnace brazing?
The temp should be about 50°F – 100°F above the liquids of the filler material that is being used.
Q10-What is proper clearance in brazing operation ?
In Normal conditions , a joint should have clearance ranging from 0.002″ – 0.005″ , It will produce very high strength joints when used flux brazing .
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