TYPE WELDING

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    23-Apr-2017

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  • 1

    DESAIN LAS(Welding Design)

    Departemen Metalurgi & Material

    Fakultas Teknik Universitas Indonesia

    Konsep Desain & Fabrikasi Las

  • 2

    Sambungan Las (Weld Joint)

    Sambungan las merupakanpenerima logam pengisi yangdidepositkan.

    Sambungan las dipilihberdasarkan lokasi, persiapan yang diperlukan, peralatan pengelasan yang

    digunakan, dan aplikasi sambungan las.

    Sambungan las dasar terdiri dari butt (tumpul), lap (tumpang), T, edge (sisi) dan corner (sudut)

    Sambungan Tumpul ( butt joint )

    dibentuk bila dua anggota sambunganyang berada kurang lebih dalam bidangyang sama didekatkan antara ujung satusama lainnya.

    dapat digunakan dengan atau tanpapersiapan terhadap anggota sambunganyang memiliki ketebalan yang samaataupun berbeda.

    umumnya digunakan pada subassemblies,selama fabrikasi dan proses perbaikan.

  • 3

    Butt Joint

    Butt joint- a jointbetween twomembers alignedapproximately inthe same plane

    Different Edge Shapes andSymbols for some Butt-Joints

  • 4

    Application for some Butt-Joints

    Sambungan Sudut (corner joint)

    Merupakan sambungan las yang dibentukbila dua anggota sambungan diposisikanmembentuk sudut kurang lebih 90

    dengan sambungan las pada bagian luaranggota sambungan.

    Umumnya digunakan pada konstruksibejana tekan dan tangki. Logam pengisidapat dibutuhkan dan dapat pula tidaktergantung pada desain dan fungsisambungan.

  • 5

    Corner Joint

    Corner joint - a jointbetween two memberslocated at right anglesto each other

    Some Different Edge Shapesand Symbols for Corner Joints

  • 6

    Sambungan T ( T-joint )

    Merupakan sambungan las yang dibentukbila dua anggota sambungan diposisikankurang lebih 90 satu sama lain dalam

    bentuk T.

    Jika dimungkinkan, dilas pada keduasisinya untuk mendapatkan kekuatanmaksimum.

    umumnya digunakan dalam fabrikasistruktur penopang dimana bebanditransfer ke bidang yang berbeda padakurang lebih 90.

    T-Joint

    T- joint - a joint betweentwo members locatedapproximately at rightangles to each other inthe form of a T

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    Some Different Edge Shapesand Symbols for T-Joint

    Application for T-Joint

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    Sambungan Tumpang (lap joint)

    Merupakan sambungan las yang dibentukbila dua anggota sambungan diposisikansaling menumpuk satu sama lain.

    Lebih kuat dibandingkan dengansambungan tumpul, tetapimengakibatkan terjadinya penambahanberat.

    umumnya dilas pada kedua sisinya

    umumnya digunakan selama prosesperbaikan dan untuk menambah panjangmaterial standar ke panjang yangdiperlukan

    Lap Joint

    Lap Joint- a jointbetween twooverlappingmembers

  • 9

    Some Different Edge Shapesand Symbols for Lap Joints

    Sambungan Sisi (edge joint)

    merupakan sambungan las yangdibentuk bila sisi dua anggotasambungan akan disambung.

    sisi yang dilas sejajar satu samalain.

    sering dipakai dalam menyambungstruktur penopang dan struktur bajayang pendek.

  • 10

    Edge Joint

    Edge joint- a jointbetween the edges oftwo or more parallelor nearly parallelmembers

    Some Different Edge Shapesand Symbols for Edge Joints

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    Proper terminology is needed ineveryday job communication

    Joint design identifies, the shape ,dimensions, and configuration ofthe joint

    The individual workpieces of a jointare called members .

    Three types members : nonbuttingmember, butting member , andsplice member

    A non-butting member is a joint member that is free to movein any direction perpendicular to its thickness dimension

    A butting member is a joint member that is prevented, bythe other member from movement in one direction

    perpendicular to its thickness dimension

  • 12

    A splice member is the work piece thatspans the joint in a spliced joint

    Single-splicedbutt joint

    Double-splicedbutt joint with

    joint filler

    Types of Welds

    Numerous welds can be applied to the varioustypes of joints

    Considerations when choosing joint geometryand weld types:

    accessibility to the joint for welding

    type of welding process being used

    suitability to the structural design

    cost of welding

  • 13

    Jenis Lasan(Types of Weld)

    groove,

    fillet,

    plug,

    slot,

    stud,

    spot,

    projection,

    seam,

    back atau backing weld,

    surfacing dan

    flange.

    Types of WeldsGroove Welds

    A groove weld is a weld made in a groovebetween the work pieces

    There are eight types of groove welds

    Square-groove

    Scarf

    V-groove

    Bevel-groove

    U-groove

    J-groove

    Flare-v-groove

    Flare-bevel-groove

  • 14

    Groove WeldsSquare and double square-groove welds

    Square-groove welds are the most economicalto use, but are limited by thickness of themembers

    Welds for one side are normally limited to a1/4 inch or less

    Groove WeldsV-and double V-groove welds

    With thicker materials joint accessibility must beprovided for welding to ensure weld soundnessand strength

  • 15

    Groove WeldsBevel- and double-bevel-groove welds

    Bevel- and J- groove welds are more difficult to weldthan V- or U-groove welds

    Bevel welds are easier in horizontal

    Types of WeldsU-groove and Double U-groove

    Welds in using J- and U-grooves can beused to minimize weld metal

    These welds are very useful in thickersections

  • 16

    Groove WeldsJ-and double-J-groove welds

    J-groove are moredifficult to weldbecause of the onevertical side (exceptin horizontal)

    J-and U- are usedwhen economicfactors outweigh thecost of edgepreparation

    Groove Weldsflare-bevel and flare-v-groove welds

    Flare -bevel andflare-v-groove weldsare used inconnection withflanged or roundedmember

  • 17

    Groove WeldsScarf

    Scarf is used forbrazing

    Groove Welds

    Their names imply what the actualconfigurations look like when viewed in across section

    Single groove welds are welded fromonly one side

    Double groove welds are welded on bothsides

    Groove welds in many combinations areused selection is influenced byaccessibility, economy, adaptation tostructural design

  • 18

    Groove Welds

    Fillet Welds

  • 19

    Ir. Winarto, M.Sc. PhD

    Welding Symbols

    Understanding Welding Symbols

    Terms and Definitions

  • 20

  • 21

    Reference Line (Required element)

    Arrow

    Tail

    Reference Line must always be horizontal,

    Arrow points to the line or lines on drawing which clearly identify the proposed joint orweld area.

    The tail of the welding symbol is used to indicate the welding or cutting processes,as well as the welding specification, procedures, or the supplementary informationto be used in making the weld.

  • 22

    Reference Line (Required element)

    Arrow

    Tail

    Reference Line must always be horizontal,

    Arrow points to the line or lines on drawing which clearly identify the proposed joint orweld area.

    The tail of the welding symbol is used to indicate the welding or cutting processes,as well as the welding specification, procedures, or the supplementary informationto be used in making the weld.

    Basic components of a WELDING SYMBOL

    Tail omitted when reference not used

    Arrow connects reference line to arrow sidemember of joint or arrow side of joint

    A circle at the tangent of the arrow and the reference linemeans welding to be all around.

    All the way Around

  • 23

    A flag at the tangent of the reference line andarrow means Field Weld.

    Field Weld Symbol

    ARROW SIDE

    OTHER SIDE

    Weld Symbol Terminology

  • 24

    Break in arrow means arrow side must be sidethat beveling or other preparation required.

    Fillet Weld (Arrow Side Only)

  • 25

    Fillet Weld (Other Side)

    1/4

    1/4

    Size of Fillet Weld Noted

  • 26

    1/4

    1/4

    (5/16)

    (5/16)

    Depth of preparation orgroove

    Depth of penetration

    Example of Double Bevel Groove weld

    Ir. Winarto, M.Sc. PhD

    Plug or Slot Weld Symbol

    Arrow Side

  • 27

    5/16

    5/16

    What does this symbol Represent?

    Single-Bevel-Groove and DoubleFillet weld Symbols

  • 28

    Ir. Winarto, M.Sc. PhD

    Chain Intermittent Fillet WeldWeld both sides each end and 10inches center to center in between

    1/4

    1/4

    2-10

    2-10

    10 in

    Ir. Winarto, M.Sc. PhD

    Staggered Intermittent Fillet WeldWeld ends than 10 inch centersstaggered each side

    10 in

    10 in

    2-10

    2-101/4

    1/4

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  • 30

    Tabel 1.1 Daftar metode pengujian takmerusak berikut singkatannya

    Tabel 1.1 Daftar metode pengujian takmerusak berikut singkatannya

  • 31

    KEKUATAN SAMBUNGAN LASAN

    Dalam mendesain suatu struktur yang difabrikasi dengan pengelasan,berbagai jenis kukuatan sambungan las harus menjadi pertimbangan,seperti kuat tarik, energi terserap (impact), kuat fatik dan lain-laintergantung pada spesifikasi yang diberikan atau dipersyaratkan.

    Formula yang dapat digunakan untuk menentukan kekuatan sambunganuntuk lasan dengan alur dan las sudut adalah:

    dimana:P = beban yang diberikanSs/c = tegangan tarik atau tekan pada penampang leher (throat)Ss = tegangan geser pada penampang lehera = tebal leherl = panjang logam las efektif a l = luas penampang leher.

    la

    PS

    la

    PS s