西安骏焊专业进口焊条进口焊丝特种焊接材料店铺
低合金耐热钢焊条
名称：cromocord 91电焊条： 耐热抗蠕变钢
用于焊接承受740℃x8小时的回火热处理的厚壁铸件，以及经受高温短时回火处理（例如760℃x2小时）的薄壁构件，譬如管道等。焊缝金属经在役脆化试验验证。真空包装。
品牌：奥林康
备注：价格为1公斤的价格！
包装：5公斤/盒；长度350mm
说明：cromocord 92碱性药皮焊条，焊接服役温度600℃以下的9cr-0.5mo-w-v-nb-n型高温抗蠕变钢。
cromocord 92
品牌：奥林康
lb-52nsu日本神钢焊条 低合金低温钢高强钢焊条进口焊条进口焊丝
西安骏焊专业销售日本神钢焊条焊丝
4.1. lb-52nsuwhen pipe root pass welding must be conducted from outside rather than inside in order to form 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 metal 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
gradewelding
passlow hydrogen typehigh
cellulose
type
vertical
upward
vertical
downward
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
gradewelding
passtemperature (°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 metal (mass %)
csimnpsnitib
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 metal
tensile propertiesnotch 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)1234ave.
3.2 2.8 3.3 3.5 3.0 3.2
note: tested method: 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
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 . 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 metal. 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 metal 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
metal
table 6: chemistries of butt joint weld metal (mass %)
locationcsimnpsnitib
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 metal
locationtensile properties
center 0.2%ps
(mpa) ts
(mpa) el
(%) ra
(%)
506 577 25 81
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