1 groove dimension is in the process of spot group solder of pressure vessel, we can be encountered smooth, stand, horizontal, admire wait for a variety of soldering the position, and solder the amount is large, the solderer is easy and fatigue, solder to assure already quality, rise again solder speed, improvement solders condition, we are OK from the groove form proceed with that be designed reasonably and chooses different parameter dimension. Wait to be admired in order to make the same score to next the temperate zone on sphere, temperate zone and plate flat-fell seam solder and make the same score what the position that admire solder gives priority to to solder approximately component, answer to increase the workload of flat position welding on groove design, reduce the workload that admire solder, accordingly, can use differ of deepness solder groove (graph 1) . Use the groove of this kind of form, basically have 3 effect: It is good that position of ① flat position welding imposes solder requirement, solder electric current can increase appropriately, increase solder speed; Lengthen of retention period of ② electric arc, prevent to bite an edge, and solderer operation is apt, solder quality also can rise accordingly; ③ admires solder position to apply solder quantity to decrease, can reduce the difficulty that apply solder accordingly, and decrease as a result of groove width, electric arc is transverse swing extent also decreases accordingly, electric arc also is centered relatively, solder quality assures easily, not easy generation bites an edge. (H of conditional H ＞ , b ＞ B) pursues the solder that annulus seams between 1 each belt puts through often use horizontal position welding, this kind solders weld defects of positional easy generation. To improve the condition applying solder of position of horizontal position welding, rise solder quality and speed, can use the groove form that angle of groove of fluctuation board edge differs. Because the difficulty applying solder of Fu horizontal position welding and Yang Heng solder is different, the groove form that still can use deepness of groove of the similar smooth position that admire solder to differ (graph 2) . The characteristic of this kind of groove basically is: β of ＞ of α of board edge groove, can solder in order to prevent fused gold follower drips in bath, the solderer operates difficulty to decrease, prevent to go up by the side of the bite of board edge. Still can increase electric current appropriately, solder in order to rise speed, in the meantime, assure easily also to solder quality, when H ＞ H, its action is as similar as the equal seat that admire solder. (Conditional α > β , h>h) pursues 22 groove form (connect of 1) butt joint: Butt joint connect is all sorts of soldering use in the structure most, also be form of the most perfect a kind of connect, for example, the welding line of vertical, link of boiler drum is butt joint connect. Usually, manual arc welding solders when the weldment that 14 Mm solders with automatic solder under 6 Mm, use V form groove, treatment of V form groove is more convenient, but the workpiece after solder is incidental be out of shape; When plate thickness is 12 ～ 60 Mm, can use X form groove, x form groove is better than V form groove, below same ply, it can reduce solder to wear metallic quantity makes an appointment with 1/2, additional, because welding line is symmetrical, weldment is out of shape small, it basically is used at big ply and requirement to be out of shape in lesser structure; The solder of U form and groove of double U form is worn metallic quantity is fewer, solder be out of shape little also, but treatment of this kind of groove is more sophisticated, it is more important to be in only commonly reach board thick use in older structure, the annulus that if utility boiler drum uses arc welding,solders is seamed often use this kind of form. Make in industrial boiler in, because accept treatment condition restriction, use the X form groove of V form groove and asymmetry commonly, to cylindrical shell of small diameter drum, when inside inconvenience applies solder with automatic solder, often use V form groove. (2)T form connect: Board thick groove need not leave when 30 Mm is the following, if contact needs to bear load, should mix by plate thickness pair of structural strength demands, can choose the groove form such as unilateral V form, K form or double U form respectively, make sure solder is appeared, to actuating pressure ≥ 9. 8The boiler of MPa, when its drum or header and pipe undertake fillet weld joins, no matter how must ply be on tubal end or drum, header,open groove. (3) horn receives contact: The drum in small-sized boiler belongs to this kind of form with the join that seal a head, differ according to weldment ply and groove preparation, horn receives contact to be able to be divided to do not open form of groove, unilateral V, V form and K body 4 kinds of forms. (4) lap joint: The advantage of lap joint is not to need groove, the dimension requirement when at the same time contact is assembled is not strict. The place on put together is narrated, choose reasonable solder contact groove form, can rise not only solder speed, improvement solders condition, reduce labor intensity, and assure easily solder quality, enough attention should be caused in pressure vessel workmanship. CNC Milling