Lesson 14 WelderQuals_New2.ppt

7/17/2019 Lesson 14 WelderQuals_New2.ppt

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API 510 Preparatory ClassAPI 510 Preparatory Class

Lesson 14Lesson 14

Welders QualificationWelders Qualification


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SECTI! I"

Welders Qualifications / Essential Variables


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We will discuss all of the welders essential

variables listed in QW-353 for the SMAW

process !lease turn to pa#e 5$of Section"#


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QW-353

Shielded Metal-Arc Weldin$ %SMAW&

Welder Essential %aria&les

6he first essential variable listed is' (ac)in# %7eoval of&

"f a welder is 8ualified usin$ an9 t9pe of bac1in$: and as1ed

to perfor an open root weld he ust retest without bac1in$

to be 8ualified to perfor the weldin$

6he 2ode definition of bac1in$ is weldin$ with a bac1in$ bar

or retainer: weldin$ double sided welds where the weld etal

of the first pass is used after $ou$in$/$rindin$ as weld etalbac1in$ for the balance of the weld illet and partial

penetration weldsare also considered weldin$ with bac1in$


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QW-353



6he ne;t inline is a chan$ein Pipe *ia+eter

,ualified As pipe diaeters becoe saller the

difficult9 for a welder is increased resultin$ in ahi$her s1ill level re8uireent

So this translates to a chan$e in diaeter to

one saller than 8ualified b9 the welders pipe

coupon on a previous test with this process

6he ran$es of pipe diaeters 8ualified are $iven

in Section "#: turn to pa$e 14- in Section I"


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QW-452.3 GROOVE-WELD DIAMETER

LIMITS

As we can see/. inch %>3&8ualifies , inch to unliited

3 ?ver )->/. inch %>3& 8ualifies )->/. inchto unliited


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LIMITS

Qui.

, "f a welder 8ualified on a 4!S inch pipe

coupon the ran$e of diaeter 8ualifications

in production with the W!S he tested to will

be @@@@@@@@@

) "f tested with a 4!S ) inch coupon what ishis iniu and a;iu diaeter ran$e

is @@@@@@@@


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LIMITS

Qui.

, "f a welder 8ualified on a 4!S inch pipe

coupon the ran$e of diaeter 8ualificationsin production with the W!S he tested to will

be $/23 to unli+ited

) "f tested with a 4!S ) inch coupon what ishis iniu and a;iu diaeter ran$e

is 13 to unli+ited


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QW-353


P/!u+&ers !-4ubers serve to $roup etalsb9 echanical and cheical properties So it isreasonable to thin1 that not all etals can be

welded usin$ the sae techni8ue: or have thesae level of difficult9 for welders

6here are tree basic !-4o $roupin$s forwelder 8ualifications "f a welder chan$es to a !-

4o $roup that he/she has not 8ualified for then aretest is re8uired We will have a +oretorou# lessonon Alternate +ase Metals laterin this course


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QW-'3)

4ubers

We have now arrived at the iller Metal 4uber

or / !u+&er - 4ubers are a $roupin$ of

electrodes and filler +etalsthat weld in asiilar wa9 and in $eneral present ore or less

difficult9 for a welder "n other words soe -

4uber filler etals re8uire different s1ills than

others and ust be 8ualified individuall9 in ost

cases


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QW-'3)

4ubers

6he table of 4ubers coin$ up is read in the

followin$ wa9

BE##,. stands for all SMAW electrodes endin$in ,. such as E->(,.: E->(,.-A,: .(,.-+, etc

So all of the above are -4uber '

BE##,( would be E-(,( with an -4uber of 3B6he ## is the tensile stren$th >(:((( !S" ect

6urn now to Pa#e 1-$of Section "#


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QW-'33 Alternate -4ubers for Welder

!erforance Qualifications

2han$in$ the 4uber for a welder a9 affect

his abilit9 to weld and re8uire re8ualification

6here are soe provisions for usin$ lower -4ubers when 8ualif9in$ with nubers ) to '

but: there are restrictions on those 8ualifications

6urn now to Pa#e 1- of Section "#


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E;aples

, sin$ the table QW-'33: if a welder 8ualifies

6itout &ac)in#with an electrode assi$ned to-4uber ' What -4ubers can he use 6it

&ac)in#in a production weldC

) What 4ubers can he weld 6itout

&ac)in#C


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Solution

, De can weld -4ubers , throu$h ' with

bac1in$ oin$ ri#t across te ro6 titled

7Qualified Wit3 to -4uber ' withoutbac1in$ten do6n toeach 8in the bo;es: then

left toreadthe 7Qualified or3 Colu+nwe find

4ubers19 $9 - and 4 6it &ac)in#:

)Also the7Qualified or3 4uber '6itout

bac1in$is included which a1es sense as he

perfored that weld for his test


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4otice that the lar$e table onl9 addresses -

4ubers , throu$h 5 6he rest of the -4ubersare in a sall table alon$ with notes beneath

the lar$e table Fets have a loo1 at those


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QW-'33 Alternate -4ubers for Welders


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QW-'5), %b&

6hic1ness ?f Weld Metal 0eposit

6he fifth essential variable listed is can#e in

tic)ness of Weld deposit:

A welder is restricted &y te a+ountof weld

etal he deposits durin$ his perforance

8ualification test with a particular: 6eldin#

process9 electrodefiller +etal /nu+&erin aP/!u+&erbase etal cobination We will now

have a loo1 at those rules

6urn to Pa#e 14$of Section "#


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QW-'5), %b&


6he colun G6hic1ness t: of weld etal in the

coupon refers to the aount of weld etal fro

a process or a filler etal !erhaps a bit of E-(,( and the rest E->(,. !erhaps 6AW root

and SMAW fill passes and cap


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QW-'5), %b&


E;aple

Assue one weldin$ process: SMAW and one

electrode E->(,. usin$ a !-4o, pipeA coupon thic1ness of -2inch was welded

usin$ E/012 "n the colun on the ri$ht titled

G6hic1ness of weld etal 8ualified we see $t:

so ) ; 3/.H I -4H this is the a;iu aount

of E->(,. %-4o '& : that the welder can

deposit in production


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QW-'5), %b&


Suppose now the coupon is ,/)H thic1 and a

welder welds it with ,((J E->(,. usin# - 6eldlayers: we see that welders liit of deposited

weld etal with an -4o' is the a;iu to be

welded


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QW-'5), %b&


Another cobination in the ,/)H coupon

,/.H of E-(,( %-4o3& and 3/.H of E->(,. +9the first colun ) ; ,/.H I ,/'H of E-(,( %-

4o3& and ) ; 3/.H I 3/'H of >(,. %-4o'& 6he

welder can deposit up to 14H of an9 -4o3 and

-4H of an9 -4o' with an9 production W!S heis otherwise full9 8ualified for: eanin$ position:

diaeter: !-4o: bac1in$: pro$ression etc


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QW-'5), %b&


Qui=

Dow can we 8ualif9 a welder for unli+itedtic)nesswith both -4o3 and ' in a sin$lecouponC

"f he or she welds a coupon that is at least @@@thic1 and deposits at least@@@H of E-(,( and at

least @@@H of E->(,. usin$ a iniu of @@@@la9ers of each filler etal

K Dint See 4ote , of table QW-'5),%b&


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QW-'5), %b&


Solution

"f he or she welds a coupon that is at least ,H

thic1 and deposits at least ,/)H of E-(,( and atleast ,/)H of E->(,. usin$ a iniu of three

weld la9ers for each filler etal

6he welder can deposit unliited t with an9 -4o3 and/or -4o' with an9 production W!S he

is otherwise full9 8ualified for such as: position:

!-4o: bac1in$: diaeter: pro$ression etc


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QW-353Welder Essential %aria&les

6he ne;t essential variable listed is Position:

2onsider the weldin$ positions versus the welder

test positions for a oent We will use pipe test

coupons !ositions for pipe tests are desi$nated b9an alphanueric such as 1;: 1 desi$nates the

coupon orientation: in this e;aple the pipe is on

the hori=ontal and is rotated/rolled beneath the

welder and is considered to be flat weldin$ 6he eans a $roove butt weld 6he others are ): 5

and:

6urn to Pa#e 142QW-',' in Section "#


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QW-','

roove Welds in !ipe L 6est !ositions

6he ore difficult the test position: the ore

positions a welder can perfor 6he four

positions for weldin$ are lat: Dori=ontal: Vertical

and ?verhead

6hese are referred to as

he/she is 8ualified to weld an9 of thoseetals to$ether (e 6arned tis is furterli+ited &y te /nu+&er ?s@F


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"f a welder 8ualifies on ! ), to ! )5 he/she is

8ualified to weld an9 of these etals to$ether

or an9 cobination of these aluinu allo9s

to$etherP


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"f a welder 8ualifies on ! 5, to ! 53 or ! , to )

he/she is 8ualified to weld an9 of these etals

to$ether or in an9 cobination of 6itaniu orirconiu allo9P


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"n theor9 a welder could be 8ualified for all the listed

base aterials b9 weldin$ Rust three %3& coupons7eeber our lesson on iller Metal 4ubers %-

4ubers& 6his is where the welders liitations

becoe ver9 iportant

?ne of the essential variables for a welder is the -

4uber of the electrode he 8ualifies with durin$ a

$iven test


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Suppose a welder 8ualifies with SMAW usin$ an -

4o' electrode the test coupon is a !-4o, base

aterial

6he welder has 8ualified to weld ! 4o , to ,,: 3'

or ', throu$h '> So lets have hi weld one of thenic1els: a !-4o', Assue it will be re8uired to

a1e the weld with a filler etal that is desi$nated

as a -4o', in Section "# Tere is a pro&le+:

he has not 8ualified an9 of those etals with a -4o', filler etalDe would have to prove his s1illwith the -4o', filler etal


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De is 8ualified for SMAW usin$ a -4o' electrode

not -4o', 6he welder will have to test a$ain on

an9 of those etals usin$ a SMAWelectrode

desi$nated as a -4o',: wh9 because the -

4ubers ' and ', are considered to re8uire

different s)ill leBels to 6eld 6he -4uber is awelders essential variable as well as a

procedures

Welders are liited b9 all of the followin$ essential

variables %s)ill issues&: which are in Section "#for the weldin$ processes listed on pa$e 5)

QW 353


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QW-353


Essential %aria&les

!ara$raph

QW '() '

*oints

QW '(3 ,

+ase Metals ,.QW '('

iller Metals ,5

3(

QW '(5 ,

!ositions 3

+rief of Variables

0eletion of +ac1in$

2han$e !ipe 0iaeter

2han$e in ! 4uber

Can#e in !u+&er

2han$e in weld etal t deposited

Addition of a position

2han$e fro vertical p to 0ownor 0own to ! pro$ression


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Sipl9 put the welder +ust ,ualify allof his/heressential variables: not Rust be 8ualified to weld a

particular !-4uber "n our e;aple he/she is

dis8ualified for the nic1el allo9 weld because of the

re8uired -4uber 8ualification bein$ -4o', as

listed on the W!S/!Q7


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A welder is liited b9: process: pipe diaeter: !-

4uber:/ !u+&er: weld etal thic1ness:

position: bac1in$ and pro$ression

All of these Essential Variables ust eet the

re8uireents of the W!S to be used in the

production weld


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0estructive 6estin$ of Welders

Qualification 2oupons

6here are three ites that ust be

addressed when perforin$ destructive

testin$ of a welders test coupon

,6he t9pe of the speciens re8uired

) Dow an9 speciens are re8uired

3 Where in the test coupon speciens shall

be ta1en fro


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6hese ites are listed in Article "V

Weldin$ 0ata of Section "# in a tabular

for: '5),%a& and are accopanied b9notes referencin$ para$raphs found in

Article """: of Section "# 6he t9pe and

nuber a listed in that para$raph6urn now to Pa#e 14$of Section "#


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4otice that the notes underneath the table do the


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4otice that the notes underneath the table do the

followin$ thin$s Weld Metal thic1ness

Lesson 14 WelderQuals_New2.ppt

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Transcript of Lesson 14 WelderQuals_New2.ppt