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LB-52NSU日本神鋼焊條
LB-52NSU日本神鋼焊條
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上架日期:2019-06-25 17:07:18
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詳細(xì)說(shuō)明

    LB-52NSU日本神鋼焊條 低合金低溫鋼高強(qiáng)鋼焊條進(jìn)口焊條進(jìn)口焊絲

    西安駿焊專(zhuān)業(yè)銷(xiāo)售日本神鋼焊條焊絲

    4.1. trustarc LB-52NSU

    When pipe root pass welding must be conducted from outside rather than inside in order to b the back bead inside the pipe, GTAW or SMAW are generally favored. Kobe Steel has long marketed FAMILIARC? LB-52U as well as FAMILIARC? LB-62U for this purpose, and they still serve as Kobe’s most reliable, “one and only” products worldwide.

    In addition to meeting the always-changing and diverse specifications of pipelines, TRUSTARC? LB-52NSU has been developed specifically for root pass welding of pipes for low temperature service. It is a covered, low hydrogen type electrode equivalent to AWS A5.5 E7016-G. It offers superb notch toughness at -60°C and very low diffusible hydrogen content of about 3.0ml/100g. The chemistries, mechanical properties of all weld bl and diffusible hydrogen content of TRUSTARC? LB-52NSU are shown in Tables 3, 4 and 5 respectively.

    Table 1: Covered electrodes for girth welding
    API 5L
    pipe
    grade
    Welding
    pass
    Low hydrogen type High
    cellulose
    type
    Vertical
    upward
    b
    Vertical
    downward
    b
    X42-X52 Root LB-52U
    LB-52NSU
    LB-78VS KOBE-6010
    Hot LB-52-18
    LB-52NS
    Filler & Cap
    X56-X60 Root LB-52U
    LB-52NSU
    KOBE-6010
    KOBE-7010S
    Hot LB-52-18
    LB-52NS
    KOBE-7010S
    Filler & Cap
    X65 Root LB-52U LB-88VS KOBE-7010S
    KOBE-8010S
    Hot LB-62
    LB-62D
    Filler & Cap KOBE-8010S
    X70 Root LB-62U KOBE-7010S
    KOBE-8010S
    Hot LB-62
    LB-62D
    Filler & Cap KOBE-8010S
    X80 Root LB-62U LB-98VS
    LB-108VS
    ——
    Hot LB-65D
    LB-106
    Filler & Cap
    X100 Root —— LB-118VS ——
    Hot LB-80L
    LB-116
    Filler & Cap
    Table 2: TIG and MAG wires for girth welding
    API 5L
    pipe
    grade
    Welding
    pass
    Temperature (°C)
    -20 -40 -60
    X42-X56 Root & Hot TG-S50
    MX-100T
    TG-S1N
    MX-A55T
    Filler & Cap DW-A50
    DW-A50SR
    DW-A55E
    DW-A55ESR
    DW-A55L
    DW-A55LSR
    DW-A81Ni1
    X60 Root & Hot TG-S62 TG-S60A
    Filler & Cap DW-A55E
    DW-A55ESR
    DW-A55L
    DW-A55LSR
    DW-A81Ni1
    X65 Root & Hot TG-S62 TG-S60A
    Filler & Cap DW-A55E
    DW-A55ESR
    DW-A55L
    DW-A55LSR
    DW-A81Ni1
    X70 Root & Hot TG-S62 TG-S60A
    Filler & Cap DW-A70L DW-A55L
    DW-A81Ni1
    X80 Root & Hot TG-S80AM
    Filler & Cap DW-A70L ——
    X100 Root & Hot TG-S80AM
    Filler & Cap DW-A80L —— ——

    Table 3: Chemistries of TRUSTARCTM LB-52NSU all weld bl (mass %)
    C Si Mn P S Ni Ti B
    0.06 0.62 1.25 0.016 0.004 0.50 0.014 0.0027
    Table 4: Mechanical properties of TRUSTARCTM LB-52NSU all weld bl
    Tensile properties Notch toughness
    0.2%
    PS
    (MPa)
    TS
    (MPa)
    EI
    (%)
    RA
    (%)
    Absorbed energy:J
    (Brittle fracture: %)
    FATT
    (°C)
    -80°C -60°C -40°C
    511 598 32 78 43(60)
    55(60)
    41(60)
    Av.46(60)
    44(55)
    72(55)
    58(52)
    Av.58(54)
    70(50)
    137(35)
    144(35)
    Av.117(40)
    -53
    Table 5: Diffusible hydrogen content of TRUSTARCTM LB-52NSU (ml/100g)
    Electrode dia (mm) 1 2 3 4 Ave.
    3.2 2.8 3.3 3.5 3.0 3.2

    Note: Tested b: According to AWS A4.3.(Gas chromatography)
                Welding current: 120 A (DCEP)
                Welding atmosphere: 21°C x RH10%


    Figure 3: Groove shape and pass sequence of butt joint welding with TRUSTARCTM LB-52NSU(root pass only) and TRUSTARCTM LB-52NS

    Figure 3: Groove shape and pass sequence of butt joint
    welding with TRUSTARCTM LB-52NSU(root pass only)
    and TRUSTARCTM LB-52NS

    In welding a butt joint on a 25 mm thick plate, 3.2 mm dia. TRUSTARC? LB-52NSU was used for the root pass with DC 95 amp, and 3.2 mm dia. TRUSTARC? LB-52NS was used for the second pass onwards with DC 110 amp in the vertical upward b. The preheating and interpass temperatures were kept between 115 and 135°C. Figure 3 shows the groove shape and the pass sequence and Figure 4, the macrostructure of the weld bl. The chemistries and the tensile properties are shown in Tables 6 and 7, respectively and the notch toughness properties and the transition curve of the butt joint weld bl are shown in Table 8 and Figure 5, respectively. (Note: both TRUSTARC? LB-52NSU and TRUSTARC? LB-52NS are specified as AWS A5.5 E7016-G).



    Figure 4: Macrostructure of butt joint weld bl

    Figure 4: Macrostructure of butt joint weld 
    bl

    Table 6: Chemistries of butt joint weld bl (mass %)
    Location C Si Mn P S Ni Ti B
    Face 0.07 0.31 1.40 0.008 0.003 0.50 0.013 0.0022
    Reverse 0.08 0.30 1.36 0.009 0.003 0.43 0.014 0.0023
    Table 7: Tensile properties of butt joint weld bl
    Location Tensile properties
    Center 0.2%PS
    (MPa)
    TS
    (MPa)
    El
    (%)
    RA
    (%)
    506 577 25 81

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