Flux-cored wire for all position Welding Electrode, the continuous process for automated production. The main advantages of the process:
(1) good quality welding defects are usually produced in welded joints. Equal to the diameter of the pipe welded by hand under the head a few more than the number of semi-automatic welding head, the use of semi-automatic welding reduces the defect generation probability. Usually applied NR204, NR207 metal wire is a low hydrogen, while the more traditional manual welding using cellulosic type electrode. It can be seen, semi-automatic welding can reduce the hydrogen content of the weld. Meanwhile, the semi-automatic welding heat input is high, can reduce the weld cooling rate, hydrogen escape, and to help reduce and prevent cold cracking.
Table 3 Semi-automatic flux-cored self-protection under the reference to the welding process parameters
(2) high efficiency flux cored wire welding process into the continuous intermittent mode of production. Semi-automatic welding deposition volume, less than the manual welding bead, melting faster than cellulose under manual welding increased by 15% to 20%. Welding slag is thin, easy slag removal, slag layer to reduce the time.
(3) integrated, low cost semi-automatic welding equipment is versatile and can be used semi-automatic welding, arc welding can also be used for welding or other welding methods. Thickness of 8.7mm steel pipe by welding, for example; SMAW welders to complete at least three groups, only Group 2 semi-automatic welding welders, welders at least reduce the two, but also a corresponding reduction in the number of welders and auxiliary tooling number. At the same time. Effective utilization of high flux-cored welding groove is small, saving the use of filler metal, but also improves the welding speed, arc overall cost is only half the hand.
Related to the concept of user devices and equipment, as well as to consider for hand welding and Welding Electrode for different purposes, the selection and design of welding positioner, in addition to the freedom of the main transformer, but also consider increasing the auxiliary bit degrees of freedom. Large, such as Welding Rod, to increase lift freedom of movement, such as many of the United States, Germany this product. In addition, some of the weldment, weld simple distribution of a rotary degree of freedom can solve most of the weldment and weld ship welding, a small amount of the remaining non-important weld, though, can not be implemented ship fillet weld but implementation of the fillet weld. To simplify the cost of equipment, the process will consider the single degree of freedom or functional degradation of the welding machine, that is, a single rotary positioner. According to application requirements, can also increase the auxiliary degrees of freedom. For example, the lift and the tailstock mobile and so on. There are some position change bit machine applies to welders bit technology requirements, and some degrees of freedom of the welding machine and welding. There from the station design and stability considerations, two or more welding joint design, so there have been a variety of stations transform and modular multi-degree of freedom welding positioner products.