1、 1 沈阳工业大学化工装备学院 毕业设计（论文）外文翻译 毕业设计（论文）题目： 含硫氨污水冷却器 外文题目： Head processing technology 译文题目： 封头加工工艺 院 （系）： 化工装备学院 专业班级： 过控 0802 班 学生姓名： 孙鹏博 指导教师： 闫小波 2012 年 3 月 11 日 2 Head processing technology 1.welding process 1.1welding operation Our factory common welding methods are: manual welding, argon arc weld
2、ing, submerged arc welding. (1) manual welding is mainly used for carbon steel 3-6mm plate welding. (2) submerged arc welding to more than 8mm carbon steel stainless steel sheet welding mainly. (3)3-6mm stainless steel argon arc welding with welding mainly. Commonly used stainless steel wire ER304an
3、d ER316L steel wire, commonly used to J422and J507and J426and J427low-temperature welding consumables. Flux of carbon steel used is the HJ431, stainless steel commonly used is HJ260,. As a result of welding wire flux can be easily affected with damp, stored in the infrared drying machine, flux HJ431
4、and HJ260drying temperature is 250-300 . Welding wire J422and J350drying temperature were 150 and 300 Welding process is completely in accordance with the welding execution, sheet thickness determines the welding to welding or double sided arc welding in welding, after the weld seam inspection ( RT
5、X ray ) judgment without pores, cracks and other defects, such as found in the above deficiencies, to the repair, until the filming. 1.2 welding operation standard (1) welding procedure card after receiving process, affirm the process card and physical material, quantity, unit number, specifications
6、, size instruction number is consistent, whether there is debris around the wafer, wafer splashes whether clean removal, such as treatment is not clean, will use the grinding clean. (2) there is no welding test plate, groove cutting quality can meet the requirement, material surface without obvious
7、defects, such as abnormal response. (3) according to the Regulations welding procedure card check of welding groove type and dimensions correspond to. (4) on each side of groove surface grinding, butt edge offset is not greater than the10% thickness, and not more than1.5mm. (5) point fixed the first
8、 weld layer terminal welding length not less than 50mm, arc board specifications should be 150*150mm and a mask having R arc, team rounds should be given within 8 hours of welding, or to use flame to the moisture inside the baking groove. (6) the welder holds welding and welding records for welding
9、consumables, 3 welding two class library for registration, using flux field volume should not exceed 4 hours, or to continue to back into the oven drying. (7) a, preheating plate thickness not less than 30mm carbon steel, low alloy steel, the preheating temperature of welding process by card, standa
10、rd provisions of the welding technology. B, preheating range width not less than 4mm and no less than 100mm. C, in the process of welding groove at any time temperature shall not be less than the prescribed temperature. D, when welding temperature is below 0 ( arbitrary thickness) must be heated to
11、15 or above in order to welding. (8) a before welding, welding to welding equipment inspection, examination was normal before welding facilities. According to B, the requirements of welding process welding, welding and fill in the records C, welding, welding layers shall be in accordance with weldin
12、g requirements, welding shall not be a large current, less layers. (9) removal of the root a, stainless steel cleaning before the root groove sides, within the range of 300mm, splashing paint coating. B, using carbon arc air gouging, should be selected according to the request carbon rod diameter. C
13、, root cleaning, grinding cleaning groove and two side the existence of carburized layer, oxide, slag and other sundries. Grinding width: manual welding, rust, oxide above 20mm, oil30mm above, automatic welding, rust, grease, oxides 25mm50mm groove inner grinding requirements, carbon steel, low allo
14、y steeln 10mm weld, its two ends within the range of 300mm carburized layer must be completely removed, the rest part allows the removal of more than 50%. Other non-ferrous metals must be completely clear. 3 D, root cleaning, composite steel Cr-Mo, manual welding and the thickness ofn 30mm welds sha
15、ll be examined by PT. (10) during the process of welding defect repair by welding repair welding repair monitor instruction experienced welders as. Repair welding process should eliminate soldering phenomenon, or polished after welding, the following defects must be removed before welding to welding crack, partial pits the stoma A shall not be lower than the parent material, weld. B, there shall be no undercutting.
