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GREATER NOIDA INSTITUTE OF TECHNOLOGY

DEPARTMENT OF MECHANICAL ENGG.

SEMINAR PRESENTATION

ON

UNDER WATER WELDING

Submitted To: Submitted By:

Mr. Syed Qaiser Husain Varun Yada

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INTRODUCTION

Underwater welding is an important tool for

underwater fabrication works

In !"#$% special waterproof electrodes werede&eloped in 'olland b( )*ander Willingen+,

In recent (ears t-e number of offs-ore structures

including oil drilling rigs% pipelines% platforms are

being installed significantl(

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CLASSIFICATION

Under water welding can be classified as .

i Wet welding

ii Dr( welding

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WET WELDING

Key technology o! !e"#$!$ng %#!$ne &t!'ct'!e

Wel($ng $& "e!o!%e( 'n(e! )#te! ($!ectly e*"o&e( to

the )et en+$!on%ent

Inc!e#&e( !ee(o% %o+e%ent %#,e& %o!e eect$+e-e$c$ent #n( econo%$c#l

S'""ly $& connecte( to the )el(e!(!$+e! +$# c#/le& o!ho&e&

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Co%"lete $n&'l#t$on o the c#/le& #n( ho&e& #!e

e&&ent$#l $n c#&e to "!e+ent the ch#nce o! elect!$c

&hoc,

MMA 0M#n'#l Met#l A!c1 )el($ng $& co%%only '&e(

"!oce&& $n the !e"#$! o o&ho!e "l#to!%&.

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PRIN!IP"E O# OPERATION

The )o!, $& connecte(to the "o&$t$+e &$(e o(c &o'!ce #n( elect!o(eto the neg#t$+e

The t)o "#!t& o thec$!c'$t #!e /!o'ghttogethe! #n( then&l$ghtly &e"#!#te(

An elect!$c c'!!entocc'!& $n the g#" #n(c#'&e& # &'&t#$ne( &"#!,)h$ch %elt& the /#!e%et#l o!%$ng # )el(

"ool

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The l'* co+e!$ng the elect!o(e %elt& to"!o+$(e # &h$el($ng g#&.

A!c /'!n& $n the c#+$ty o!%e( $n&$(e the l'*co+e!$ng- )h$ch $& (e&$gne( to /'!n &lo)e!th#n the %et#l /#!!el to the elect!o(e

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AD2ANTAGES

The +e!&#t$l$ty #n( lo) co&t.

Le&& co&tl$e! th#n (!y )el($ng.

S"ee( )$th )h$ch $t $& c#!!$e( o't

No enclo&'!e& &o no t$%e $& lo&to! /'$l($ng.

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DISAD2ANTAGES

R#"$( 3'ench$ng o the )el( %et#l /y the&'!!o'n($ng )#te!.

Wel(e!& )o!,$ng 'n(e! )#te! #!e!e&t!$cte( $n %#n$"'l#t$ng #!c.

Hy(!ogen e%/!$ttle%ent c#'&e& c!#c,&.

Poo! +$&$/$l$ty ('e to )#te!cont#%$n#nce.

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DRY WELDING

A ch#%/e! $& c!e#te( ne#! the #!e# to /e)el(e( #n( the )el(e! (oe& the 4o/ /y

&t#y$ng $n&$(e the ch#%/e!. It "!o('ce& h$gh 3'#l$ty )el( 4o$nt& .

The g#&5t'ng&ten #!c )el($ng "!oce&& $&

'&e( %o&tly o! "$"e )o!,& G#& %et#l #!c )el($ng $& the /e&t "!oce&&

o! th$& )el($ng.

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CLASSIFICATION OF DRY

WELDING

The!e #!e t)o /#&$c ty"e& o (!y )el($ng 6

$. Hy"e!/#!$c )el($ng

$$. C#+$ty )el($ng

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LIMITATION65

A& (e"th $nc!e#&e "!e&&'!e #l&o

$nc!e#&e&- $t #ect& /oth o!(!$+e! #n( )el($ng "!oce&&

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AD2ANTAGES65

Wel(e!($+e! &#ety

Goo( 3'#l$ty )el(

S'!#ce %on$to!$ng

Non (e&t!'ct$+e te&t$ng

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DISAD2ANTAGES65

T$e $abitat %e&din' re(uires &ar'e

(uantities o) *om+&e, e(ui+ment

and mu*$ su++ort e(ui+ment on t$e

sur)a*e

!ost is e,treme&y $i'$

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RISKS 2S PRECAUTIONS

R$&, o elect!$c &hoc, &o #ch$e+$ng elect!$c#l$n&'l#t$on o elect!$c#l )el($ng e3'$"%ent&

Hy(!ogen #n( o*ygen #!e "!o('ce( /y the#!c $n )et )el($ng #!e "otent$#lly e*"lo&$on&o "!ec#'t$on %'&t /e t#,en to #+o$( the/'$l( '" o "oc,et& o g#&

The l$e o! he#lth o the )el(e! )$ll /e $n!$&, !o% n$t!ogen $nt!o('ce $nto the /loo(&t!e#%- "!ec#'t$on& $ncl'(e the "!o+$&$on o#n e%e!gency #$! o! g#& #""l$e(

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Sco"e o '!the! (e+elo"%ent&

Hy"e! /#!$c )el($ng $& )ell e&t#/l$&he( #n(gene!#lly )ell !e&e#!che(.

Re&e#!ch /e$ng c#!!$e( o't o! )el($ng #t #

!#nge o 788 to 9888% (ee". THOR59 0T$g Hy"e!/#!$c O!/$t#l Ro/ot1 $&

(e+elo"e( )he!e ($+e! "e!o!%& "$"e $tt$ng-$n&t#ll& the t!#c,& #n( o!/$t#l he#( on the "$"e

#n( !e&t "!oce&& $& #'to%#te(.

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APPLICATIONS

O&ho!e con&t!'ct$on o! t#""$ng &e#!e&o'!ce&

Te%"o!#!y !e"#$! )o!, c#'&e( /y &h$":&

coll$&$on&- 'ne*"ecte( #cc$(ent&

S#l+#g$ng +e&&el& &'n, $n the &e#

Re"#$! #n( %#$nten#nce o &h$"&

Con&t!'ct$on o l#!ge &h$"& /eyon( thec#"#c$ty o e*$&t$ng (oc,&

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THANK YOU

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