BS EN 1011-3-2000 - Recommendations for Arc welding of stainless steels.pdf (2).ppt

7/17/2019 BS EN 1011-3-2000 - Recommendations for Arc welding of stainless steels.pdf (2).ppt

http://slidepdf.com/reader/full/bs-en-1011-3-2000-recommendations-for-arc-welding-of-stainless-steelspdf 1/25



EN 1011-1 general guidance forarc welding

EN 1011-2 arc welding of ferriticsteel

EN 1011-3 arc welding of stainlesssteel



Gives general guidelines for the satisfactoryproduction and control of welding.

etails the possi!le detrimental phenomenawhich may occur.

"dvice the methods !y which they may !eavoided.

"pplica!le to all stainless steel and isappropriate regardless of the type of

fa!rication.#ermissi!le design stresses in welds$ methodsof testing and acceptance levels are notincluded .

#ermissi!le design stresses in welds$ methods



#"&&'(E )"*E+

" thin transparent and tightly adherent %lm onthe surface of stainless steel which protects

them from corrosive attac,

E++'E N/E+" num!er indicating magnetic attraction$approimately eual to ferrite delta ferrite5content over the range of 06 to 106.



&"')'7E8 /N&"')'7E

&ta!ili9ed steel contain additions of strong

car!ide 8 nitride forming elements titanium ornio!ium5$ which limit the formation of chromiumcar!ides8 nitrides$ allowing the stainless steel toretain its corrosion resistance$ particularlyaround grain !oundaries.



't applica!le to all arc welding processes vi9

1anual metal arc welding

2Gas shielded metal arc welding- 'G8 "G3Gas tungsten arc welding

4#lasma arc welding

:&u!merged arc welding



his standard applica!le to stainlesssteel of the austenitic$ ferritic$martensitic and austenitic8ferritic

types$ according to groups ; to 10 of'&< 1:=0;.

+eference standard EN- 100;;-1



Environment shall !e controlled to avoid damage ofpassive layer which gives protection againstcorrosion

>ontact !etween stainless steel and other materialse.g car!on steel$ copper$ paint$ dyes etc. to !eavoided.

#ac,ing shall !e strongly !uild and shall !e linedwith materials that not contaminate stainless steel.

)ifting gra!s$ ?elding %tures$ earth clamps or



acilities for fa!rication of && shall !e separatedfrom other wor,s and ,ept free of all possi!lecontaminating materials such as lead$ 9inc$copper alloys$ car!on steels etc.

<nly tools dedicated to stainless steel shall !eemployed

<ides 8 slag produced during in welding shall !eremoved

@ard stampings should !e avoided



?elding details shall !e descri!ed in anappropriate ?elding #rocedure &peci%cation inaccordance withEN '&< 1:=0A

"cceptance criteria for misalignment of Boints aregiven in EN '&<-:;1C

+un on8 run oD pieces shall !e manufactured fromsimilar material and similar Boint



+emoval of +un on8 run oD pieces shall !eperformed !y method which does not adverselyaDect the properties of the weld 8 parent metal

'nspection shall !e carried out to demonstratethat the parent metal as well as weld metal arefree from unaccepta!le imperfection.

or one side welding the other side root5 to !eprotected from atmospheric contamination



?elded Boints shall !e free fromimperfections that would impair the serviceperformance of the construction

"cceptance level shall !e in accordance withthe application standard where it eists.

'f no application standard eists$acceptance level shall !e !ased on EN '&<:;1C



istortion in a weldment results fromnon uniform epansion and contraction

of weld metal and adBacent parentmetal during welding.

"ustenitic steel is more pronouncedthan un alloyed steel due to a largerepansion coecient and lowerthermal conductivity.



Recommendation for reducingdistortion1.inimise the weld metal volume2.alanced Boint welding !oth side53.+educe heat input4.+educe num!er of weld layers:./se welding seuence

=.#reset the parts to !e weldedC./se Bigs and mechanical restraints;./se correct tac, welding

A./se heat sin,s



ost readily welda!le amongst all &&

Types:

standard austenitic $ fully austenitic $ nitrogenalloyed austenitic$ heat resistant austenitic$austenitic steel with improved machine a!ility EN

100;;-15 in standard austenitic && small amount offerrite is present5



FNitrogen alloyed steels may reuirewider Boint preparationF hin sheets and plates may !e welded

without %ller wireFiller rods should !e selected as per EN1=008 120C28120C3F>onsuma!les are generally selected toget the ferrite content of 3N to 1:N inas deposited fusion 9one.FNo pre-heat or post weld heat treatments

are generally reuired



FNo pre-heat or post weld heat treatments aregenerally reuiredFNitrogen alloyed steels may reuire wider BointpreparationF hin sheets and plates may !e welded without%ller wire

Filler rods should !e selected as per EN 1=008120C28120C3F>onsuma!les are generally selected to get theferrite content of 3N to 1:N in as deposited

fusion 9one.



F>onsuma!les may contain increase manganesecontent to minimise the ris, of hot crac,ing.

F>hemical composition of the weldingconsuma!le is usually slightly over alloyedcomparing to parent metal

Shielding gases for TIG/ MIG/MAG welding -F "rgon$ "rgon - @elium$ "rgon H hydrogen$ ormitures as per EN 43A



PRO!"MS I# $"!%I#G

Solidi&cation crac'ingF #oor solu!ility of impurities li,e #hosphorus$oron$ &ulphur$ &elenium$ &ilicon etc in austeniteF &egregate along G during solidi%cationF G !ecomes wea,erF endency to develop crac,s i.e. icro %ssures

under solidi%cation stress.RemedyF y producing some ferrite 4-:65 in the weld

metalI



Recommendation for reducing hot crac' 1 &elect consuma!les with low impurity and

higher manganese content

2 Ensure cleanliness3 +educe restraint on the Bo!4 /se low heat input and avoid wide weld pools: +educe inter-pass temperature maimum1:0J>5= +educe travel speedC ?idth to depth ratio of the weld pool should

!e !etween appro. 1 to 1.:



>an !e welded with "?$ G"?$ G"?$ #"?<ther #rocess are E?$ )"&E+$ resistance welding.

erritic && are suscepti!le to ecessive grain growth.@eat input should !e ,ept low.

#re- @eating 200-300J> may used for semi ferrite gradessemi ferrite grades small amount of martensite5 forthic,ness more than 3mm.

'nter pass temperature should !e the same range.

#ic, up of car!on and nitrogen during welding to !e ,ept

minimum !y clean weld area and short arc.



"ustenitic welding consuma!les are preferred!ecause of higher ductility.'f there is a danger of sulphur pic, up during

service$ then it is to !e welded with ferritic && orferritic- austenitic && consuma!les. 'G welding can !e carried out with or without%ller wire.

>overed electrodes are to !e re H !ac,ed !eforeuse.&hielding gases should !e argon !ased mituresand not containing ><2. as per EN 43A5

nitrogen or hydrogen.



><N&EK/EN>E& < ?E)'NG

15><) >+">L'NG.

>old crac,ing due to low toughness can !eavoided !y

preheating in the range of 200 H 300J> forover 3mm

thic,ness and conditions of high restraints to

!eavoided

25 @*+<GEN E+')EEN

@ydrogen em!rittlement or hydrogen inducedcrac,in can !e avoid ! ,ee in the




3. E>@"N'>") #+<#E+'E&

echanical properties of weld metal ofaustenitic and ferritic stainless steelconsuma!les should match with the

reuirement of the parent metalerritic stainless steel of low ductility shall !epreheated from 200 to 300J> prior to coldforming




45 ><++<&'<N +E&'&"N>E

erritic stainless steel suDer from inter granularcorrosion$ unless chromium depletion isavoided !y low content of car!on and nitrogen

!y sta!ili9ation or !y annealing at the temperature !etweenC:0J - ;00J>

Documents

BS EN 1011-3-2000 - Recommendations for Arc welding of stainless steels.pdf (2).ppt