Why the trailing electron in the cooper pair doesnot cause any lattice distortion?

Only two electrons act in a co-ordinated way. Why this is not extended to an infinite chain of electrons?

02 March 2017 1,558 1 View

Why mercury is liquid at room temperature?

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31 December 2016 7,430 0 View

Why Cathodic cleaning or sputtering is ineffective in SMAW / GMAW?

Cathodic cleaning which takes place in GTAW with AC polarity helps in welding reactive metals as during DCEN cycle the surface oxide layer gets cleaned and during DCEP cycle welding takes place....

11 December 2016 8,565 1 View

How an arc gets initiated in Submerged Arc Welding (SAW) process?

The thin air column gets ionised which creates a bridge for the transfer of charged particles from electrode to workpiece and vice versa. This creates an arc. This concept holds good for SMAW,GMAW...

09 October 2016 8,914 1 View

Why DCEN is preferred over DCEP for FCAW?

09 October 2016 9,515 2 View

For calculating form factor in an electroslag welding process how width and depth are practically measured?

Form factor = width of the molten metal/depth of the molten metal & higher form factor gives good resistance from cracking. But how the width & depth are measured in practise?

09 October 2016 3,373 1 View

Why do we prefer constant current power source for Submerged arc welding (SAW) process?

Constant voltage power source is said to have better control over the parameters in a mechanised process. But still why do we prefer CC power source for SAW?

09 October 2016 6,698 6 View

What kind of heat treatments are done to the weld joint after electroslag welding?

Since the cooling is very slow, we get coarse grained weak weld region. isnt? The plates that are joined are huge structures. So are they subjected to any kind of local heat treatment (Induction...

09 October 2016 3,825 2 View

Why high form factor in electroslag welding leads to acute angle between columnar grains?

09 October 2016 3,787 2 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

I need to accelerate corrosion in steel parts that are used in a salt-water environment. Is there a technique for doing so?

I have a structure that employs d-ring swiveling tie-downs that corrode during use and become "frozen". I have sample swivel assemblies that I wish to corrode to see if I can free them using one...

01 March 2021 3,739 3 View

Why is my platinum counter electrode getting dirty during electrodeposition?

I am conducting anodic electrodeposition of MnO2 onto a stainless steel substrate, using a platinum strip as a counter electrode. This is done galvanostatically, with the current held between 5...

27 February 2021 1,829 3 View

What could be reason for getting such type of graph for complex impedance in case of polymer blend films?

Its effect appears in real part of ac conductivity also. Can anyone suggest any reason behind it?

26 February 2021 3,487 3 View

Modeling viscosity using model of Chung?

Hello, As part of simulation of gases mixture and water, I need to calculate viscosity of the fluid components and I am using relationships proposed by Chung et al. (1988). The irony is while I...

25 February 2021 8,053 5 View