2. Construction Program 图一：储罐底板对接坡口图
Figure 1: Diagram of butt joint groove for base plate of the tank
坡口加工采用机械加工。
Machining is to be adopted for processing of groove. b).组对 Assembly
底板组对点焊定位，点固焊长度不小于50mm，间距300mm。
Tack welding is to be conducted for positioning of the base plate during assembly, with the length of tack welding not less than 50mm and spacing to be 300mm. c).焊口施焊顺序（见图二）Welding sequence (see figure 2)
图二：底板对接焊道施焊顺序
Figure 2: Welding sequence in butt joint of base plate
每一焊道在焊后必须对焊口清理飞溅、残渣。焊工应加强对焊缝的自检。应结合母材的材质和厚度等因素控制层间温度。
Weld spatter and slag must be cleaned from the crater after completion of welding of each pass. Welder shall enhance self-inspection of the weld. Interpass temperature control shall be in combination with base metal material and thickness.
①④焊道在保证焊透的前提下以Φ3.2焊条、小电流、短弧进行快速密封焊。
Quick seal-welding shall be conducted with Φ3.2 welding rod, low current and short arc, provided that complete penetration can be ensured for ①④ welding pass. d).焊缝施焊顺序（见图三）
Sequence for welding of weld seam (see figure 3)
总体顺序应考虑焊缝收缩需得到补偿，即为先焊短焊缝，再焊长焊缝；由中向外。 如下图为例，1~10为短焊缝，11~22为长焊缝。
In terms of the overall sequence, considerations shall be given to compensation to the weld shrinkage, i.e. weld the short welding seam first and then the long welding seam, with direction from center towards outside.
RFQ: IN-P-2011-0155 21 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program Take following figure as an example, in which 1-10 is short welding seam and 11-22 is long welding seam.
图三：底板焊缝分布图
Figure 3 Base plate welding seam arrangement diagram
1） 短焊缝（见图四）
Short welding seam (see figure 4)
图四：短焊缝施焊顺序图
Figure 4 Welding sequence for short welding seam
将一条长焊缝以中心点为界，分为两个焊缝编号。
Divide a long weld into two weld numbers, with central point as the boundary.
采用分段退焊+跳焊法进行施焊，两个焊工采用相近的焊接参数，同时施焊。即按图四所示先同时焊D、F段，再同时焊B、H段，依次类推。再同时焊跳段部分，使焊缝整体施焊方向
RFQ: IN-P-2011-0155 22 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program 与分段施焊方向相反。
Back-step welding plus skip welding are to be adopted for welding operation, in which two welders carry out welding simultaneously with similar welding parameters. That is to say, at first, they simultaneously weld D and F sections as shown in figure 4 and afterwards B and H sections, and the like. At the same time, the skipped section shall be welded, so that the overall welding direction of the welding seam is opposite to that of the section welding. 2）. 长焊缝（见图五）
Long welding seam (see figure 5)
图五：长焊缝施焊顺序图
Figure 5: Welding sequence for long welding seam
将一条长焊缝以中心点为界，分为两个焊缝编号。
Divide a long weld into two weld numbers, with central point as the boundary.
施焊顺序同短焊缝。即当焊工甲按图示方向施焊A段时，焊工乙同时按图示方向施焊等长的B'段，再同时焊C、D'段，依次类推。再同时焊跳段B、A'等部分，使焊缝整体施焊方向与分段施焊方向相反。
The welding sequence is identical to that of short welding seam. That is to say, when welder A is welding section A in accordance with the direction as shown in the figure, welder B shall simultaneously weld section B' with same length as A and afterwards weld sections C and D', and the like. At the same time, skipped sections B, A' and etc. shall be welded, so that the overall welding direction of the welding seam is opposite to that of the section welding.
底板长焊缝的整体施焊顺序是先焊中间的焊缝，依次向两边对称施焊。即首先施焊焊缝11、16，其次22、17，再12、15，然后21、18，依次类推。
The welding sequence for long welding seam on the base plate shall be to weld the middle seam at first, and then to symmetrically conduct welding towards both sides in turn. That is to say, firstly weld the welding seam of 11 and 16, secondly 22 and 17, thirdly 12 and 15, then followed by 21 and 18, and the like. e).焊缝表面清理 Welds Cleaning
去除表面熔渣、飞溅等，用酸洗膏进行酸洗，使焊缝表面整洁美观。
RFQ: IN-P-2011-0155 23 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program Remove slag and splatter from the weld face, pickle the face with pickling paste to present a neat and clean weld face.
4.6.2储罐顶板焊接方法 Welding method for tank roof plate
a). 坡口（见图六） Groove (see figure 6)
图六：储罐顶板对接坡口图
Figure 6: Diagram for butt joint groove of tank roof plate
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。顶板组对点焊定位，点固焊长度不小于50mm，间距300mm。 Conduct assembly as per groove requirements. Tack welding is to be conducted for positioning of the roof plate during assembly, with the length of tack welding not less than 50mm and spacing to be 300mm.
c).焊口施焊顺序（见图七） Welding sequence (see figure 7)
图七：储罐顶板对接焊道施焊顺序
Figure 7: Welding sequence for butt joint pass of tank roof plate
焊道①焊后背面清根、PT检查合格后，依次进行②~③焊道的焊接。应结合母材的材质和厚度等因素控制层间温度。
After completion of post-welding back gouging and satisfactory PT inspection of welding pass ①, ②~③ welding pass shall be welded in turn. Interpass temperature control shall be in combination
RFQ: IN-P-2011-0155 24 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program with the base metal material and thickness as well as other factors. 每一焊道在焊后应对焊口清理飞溅、残渣。焊工应加强对焊缝的自检。
Weld spatter and slag must be cleaned from the crater after completion of welding of each pass. Welder shall enhance self-inspection of the weld.
d).焊缝施焊顺序（见图八）Welding sequence (see figure 8)
总体顺序应考虑焊缝收缩需得到补偿，即为先焊短焊缝，再焊长焊缝；由中向外。 如下图为例，1~10为短焊缝，11~22为长焊缝。
The overall sequence shall consider the compension for the shrinkage due for welding, which require starting from short welding seam first and then the long welding seam, with direction from center towards outside.
Take following figure as an example, in which 1-10 is short welding seam and 11-22 is long welding seam.
图八：储罐顶板焊缝分布图
Figure 8: Weld distribution diagram for tank roof plate
RFQ: IN-P-2011-0155 25 of 41 Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project