2. Construction Program 坡口加工采用机械加工。
Machining is to be adopted for processing of groove. nozzle
flange
图二十三：法兰与接管、接管与接管焊接坡口图
Figure 23: Groove diagram for welding of flanges to nozzle and nozzle to nozzle
b). 组对 Assembly
按照坡口要求进行组对。对母材进行对称点焊固定。
Assembly shall be conducted in accordance with the groove requirements. Symmetric spot welding is to be conducted to fix the base metal. c). 焊口施焊顺序（见图二十四） Welding sequence (see figure 24)
nozzle
flange
图二十四：法兰与接管、接管与接管焊口施焊顺序图
Figure 24: Welding sequence diagram for welding of flanges to nozzle and nozzle to nozzle
焊道①采用氩弧打底,管内充氩气保护。焊道②、③采用电弧焊。应结合母材的材质和厚度等因素控制层间温度。
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2. Construction Program Argon arc backing weld is to be adopted for weld pass①, in which the pipe shall be filled with argon for protection. Arc welding is to be adopted for weld passes ② and ③. The interpass temperature shall be controlled in combination with the material and thickness of the base metal. d).焊缝表面清理 Welds Cleaning
去除表面熔渣、飞溅等，使用酸洗膏酸洗，使焊缝表面整洁美观。
Remove slag and splatter from the weld face, pickle the face with pickling paste to present a neat and clean weld face. 4.6.7
补强板与罐壁焊接方法 Welding method for reinforcement pad and tank wall
a).坡口（见图二十五）Groove (see figure 25) tank body
reinforcing pad
图二十五：补强板与罐壁焊接坡口图
Figure 25 Groove diagram for welding of reinforcement pad to tank wall
坡口加工采用机械加工。
Machining is to be adopted for processing of groove. b).组对 Assembly
补强板与罐壁的曲率半径应一致。按照坡口要求进行组对。对母材进行对称点焊固定。 The radius of curvature of reinforcement pad and tank wall shall be coincident with each other. Assembly shall be made in accordance with the groove requirements. Symmetric spot welding shall be conducted to fix the base metal.
c). 焊口施焊顺序（见图二十六） Welding sequence (See figure 26)
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2. Construction Program
tank body
reinforcing pad
图二十六：补强板与罐壁焊口施焊顺序图
Figure 26: Welding sequence for reinforcement pad and tank wall
焊道①采用小电流、短弧施焊。应结合母材的材质和厚度等因素控制层间温度。 Low current and short arc shall be applied to welding of welding pass①. The interpass
temperature shall be controlled in combination with the material and thickness of the base metal. d). 焊缝表面清理 Welds Cleaning
去除表面熔渣、飞溅等，使用酸洗膏酸洗，使焊缝表面整洁美观。
Remove slag and splatter from the weld face, pickle the face with pickling paste to present a neat and clean weld face.
4.6.8 补强板与接管焊接方法 Welding method for reinforcement pad and nozzle
a) 坡口（见图二十七）Groove (see figure 27)
reinforcing pad
tank body
RFQ: IN-P-2011-0155 38 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
nozzle
2. Construction Program 图二十七：补强板与接管焊接坡口图
Figure 27: Groove diagram for welding of reinforcement pad and nozzle
坡口加工采用机械加工。
Machining is to be adopted for processing of groove. b).组对 Assembly
按照坡口要求进行组对。接管与补强板的间隙应均匀一致。对母材进行对称点焊固定。 Assembly shall be made in accordance with groove requirements. Space between nozzle and the reinforcement pad shall be uniform and consistent. Fix the base metal through symmetric spot welding.
c). 焊口施焊顺序（见图二十八） Welding sequence (see figure 28)
reinforcing pad
tank body
nozzle
图二十八：补强板与接管焊口施焊顺序图
Figure 28: Welding sequence diagram for reinforcement pad and nozzle
应结合母材的材质和厚度等因素控制层间温度。
The interpass temperature shall be controlled in combination with the material and thickness of base metal and other factors. d). 焊缝表面清理 Welds Cleaning
去除表面熔渣、飞溅等，使用酸洗膏酸洗，使焊缝表面整洁美观。
Remove slag and splatter from the weld face, pickle the face with pickling paste to present a neat and clean weld face.
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2. Construction Program 4.6.9 T字接头焊接方案 T-shaped joint welding scheme
T型接头应精心施焊，纵焊缝应焊接到横缝坡口内的焊肉，应按横缝坡口角度将堆焊的焊肉磨平。
Great care shall be taken in welding of T-shaped joint by welding the longitudinal weld to deposits inside groove of the transverse weld. Surfacing deposits shall be ground flush as per groove angle of the transverse weld.
a) 底板T字接头 T-shaped joint for base plate
底板短焊缝施焊完毕后，对T字接头处按照坡口要求进行组对。
After completion of short weld on base plate, T-shaped joint shall be assembled as per groove requirements.
b) 储罐壁和顶板T字接头 T-shaped joint for tank wall and roof plate
储罐壁和顶板纵向焊缝的下部预留100~150mm距离暂不焊，待相应的环向焊缝施焊完毕后再进行焊接。在焊接预留段时，应按照坡口要求进行打磨。
A space ranging from 100 to 150 mm shall be temporarily reserved for the lower part of longitudinal weld on the tank wall and roof plate. This part shall not be welded until corresponding circular weld has been completed with welding. Grinding as per groove requirements is necessary for welding of the reserved section.
4.6.10 预防变形措施与焊口返修 Measures against deformation and weld repair
储罐底板边缘焊缝，为预防变形，可采取反变形措施，即组对时，将坡口预先反置1.5~2°（见图二十九）。
For prevention of deformation, anti-deformation measures can be taken for weld on edges of the base plate, i.e., the groove shall be placed conversely by 1.5~2° in advance during assembly. (see figure 29)
图二十九：预防变形坡口组对图
Figure 29: groove assembly diagram for prevention of deformation
壁板焊接时为防止变形，罐内部应加好防变形胎具，防变形胎具与不锈钢板接触处需要加
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Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program 垫不锈钢薄板，防变形胎具如图三十。
To prevent from deformation, anti-deformation clamping fixture shall be arranged inside the tank for welding of the tank wall. A stainless steel thin slab shall be padded at the contact between the anti-deformation clamping fixture and the stainless steel plate. Please refer to figure 30 for the clamping fixture.
图三十：防变形胎具
Figure 30: Anti-deformation clamping fixture
焊缝返修前，应确定缺陷的位置。消除缺陷的深度不应大于板厚的2/3，且修补长度不应小于50mm。同一部位的返修，不宜超过两次。
Weld defect shall be identified prior to rewelding of the welding seam. Depth for elimination of defects shall not be more than 2/3 of the plate thickness and the length of repair welding shall not be less than 50 mm. Rewelding of one identical part shall not exceed twice. 层间焊道的起弧点和收弧点应错开、焊后应缓冷。
The interpass arcing spot and arc-closing spot shall be staggered and slow cooling is necessary after welding.
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