difference between fusion and penetration

[Rahul Chaudhari]

Dear Experts,

What is the difference between Fusion & penetration?
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[Kannayeram Gnanapandithan]

basically same but if u can see with naked eye that is penetration (protrusion of weld metal at the root), fusion can not be seen with naked eye unless etched. 

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

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[Biplab Pal]

Dear Rahul,

Fusion: the process or result of joining two or more things together to form a single entity. the process of causing a material or object to melt with intense heat so as to join with another.

Penetration: the action or process of penetrating something.

This is the difference.

On Fri, Apr 3, 2015 at 7:35 AM, Rahul Chaudhari <navy...@gmail.com> wrote:

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
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[meisam shokri arfaei]

If we search for the difference specially in the field of welding, it could be:

Some welding processes are categorized as fusion welding which we need melding during welding. In these processes we have fusion+penetration such as SMAW, SAW, ... .

In some other kinds of welding we have penetration without fusion such as friction welding (FW) or resistance welding (RW). We named these kinds of welding as solid state welding or non-fusion welding.

Regards

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M. Shokri Arfaei

ISA-ISTS - Metallurgy Lab. Manager

ASNT NDT Level III

International Welding Engineer

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[sai jagadeesh MAVUDI]

Fusion means Two materials filler/electrode and parent metal should fuse or melt for good penetration.even there is good fusion some times those two not penetrate each other.

Thanks/Regards

Sai Jagadeesh Mavudi

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