Transcript Lesson 25 IACS repair standard II

Lesson 25 IACS Repair Quality Standard for Existing Ships
Part II
CONTENTS
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1. Welding requirement
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2. Repair quality standard
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3. Doublers on plating
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4. Renewal of internals/stiffeners
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5. Renewal of internals/stiffeners - transitions inverted
angle/bulb profile
1. Welding Requirement
A.
Correlation of welding consumables with hull structural
steels
B.
C.
General requirements to preheating and drying out
Dry welding on hull plating below the waterline of vessels
afloat
Repair quality standard
Item
Standard
Limit
Material Grade
Same as original or higher
Welding Consumables
IACS UR-W17 (ref. 6)
Approval according. to equivalent
international standard
Groove / roughness
See note and Fig. 22.1
d<
Pre-Heating
See Table 22.1
Steel temperature not lower than
Welding with water on the outside
See Section 5.3
Acceptable for normal and high
strength steels
Alignment
As for new construction
Weld finish
IACS guide for inspection of ship hull welds
(ref. 10)
NDE
IACS guide (ref. 10)
NOTE: Slag, grease, loose mill scale, rust and paint, other than primer, to be removed.
Remarks
See Section 4
At random with extent to be agreed
with attending surveyors
Grind smooth
Moisture to be removed by a
heating torch
Doublers on plating
Doublers on plating
Renewal of internals/stiffeners
Item
Standard
Limit
Size insert
Min.
Min.
Material grade
Same as original or higher
Edge Preparation
As for new construction. Fillet weld stiffener web/plate to be
released over min. d =
Welding sequence
See fig.22.4 . Weld sequence is 1→ 2 → 3
Alignment
As for new construction
Weld finish
IACS guide for inspection of ship hull welds (ref. 10)
NDE
IACS guide (ref. 10)
Remarks
See Section 4.
Renewal of internals/stiffeners - transitions inverted
angle/bulb profile
Termination of straps
WORDS
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Ambient
Submerge
hydrogen
alignment
compliance
Insert
Pitch
n.
circumferencial
throat
Internals
Transition
Taper
Strap
Asymmetrical adj.
adj.
周围环境
v.
浸没
n.
氢
n.
找中、队中
n.
符合
n.
嵌补板
波高
adj.
圆周的
n.
焊喉
n.
(pl)内部构件
n.
过渡
v.
逐渐变细/薄
n.
带钢
不对称的
Phrases and Expressions
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ambient temperature
submerged arc welding
coated low-hydrogen electrode
manual metal arc welding
grind smooth
weld finish
as for new construction
at random
rounded off corner
edge preparation
slot welding
step welding
fillet weld
环境温度
埋弧焊
碱氢焊条
手工电弧焊
研磨平整
焊缝处理
如同新结构（建造）
随机（选择）
倒圆角
(焊接)接边加工
槽焊(长孔焊)
分段焊接
角焊
Assignment
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1. Review the text.
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2. Do the exercises on Page 249.