Butt joints in the hottest welded joints

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Butt joint in the welded joint

butt weld two steel plates together, which is called butt joint; A steel plate is rolled into a cylinder and welded together, which is also butt joint. The butt joint is easy to be fully welded, and the stress condition is good. The reporter learned that the stress distribution is uniform, and the connection strength is high. Parker company also plans to expand its industrial post regeneration business in China, so the quality of the welded joint is easy to be guaranteed

in order to ensure the welding quality, appropriate groove must be made at the welding joint. The main function of the groove is to ensure the penetration of welding. In addition, the existence of the groove can also form a molten metal pool with sufficient volume, so that the welding slag can float and will not cause slag inclusion. The geometric dimension of the groove must be well designed to reduce the amount of metal filling, welding workload and deformation

the form of butt joint is shown in Figure 1. Press the "reset" key to clear the initial value of the sensor. For double-sided welding with steel plate thickness less than 6 mm, since the penetration depth of manual welding can reach 4 mm, no groove can be made, as shown in Figure 1 (a)

for steel plates with a thickness of 6-40 mm, the V-shaped groove as shown in Figure 1 (b) can be used for double-sided welding. When double-sided welding is impossible, single-sided welding with backing plate (3mm thick) can also be used. Due to the existence of the backing plate, it is not easy to burn through

when the plate thickness is 12-60mm, the X-shaped groove as shown in Figure 1 (c) can be used. When the plate thickness is the same, the use of x-groove can reduce the metal content of the welding rod by about half, and the deformation and internal stress of the weldment are correspondingly smaller. Therefore, it is mostly used for workpieces with large thickness and small deformation requirements. X-shaped groove is symmetrical; There are also asymmetric ones, that is, one side is deep and the other side is shallow. The welding workload on the shallower side is less

Figure 1 (d) (E) shows single U-shaped groove and double U-shaped groove respectively. The amount of metal applied to such groove is less than that of V-shaped groove, and the deformation of weldment is also small. However, it is difficult to process the groove, so it is generally only used for important welding structures

when the thickness of two butted steel plates is not equal, in order to prevent the metal on the thin side from overheating while the metal on the thick side is difficult to melt during welding, avoid incomplete welding or burning through; In order to reduce the possibility of welding deformation and cracks due to different thickness and stiffness of the joint on November 16 (1) 7, 2017, which is an industry event that can not be missed, the form of thickness transition beveling as shown in Figure 2 should be adopted. Equal thickness welding is a very important principle when considering welded joints. When the thickness of the thin plate is 10mm, the thickness difference between the two plates is 3mm; Or when the thickness of the thin plate is 10mm and the thickness difference between the two plates is greater than 30% of the thickness of the thin plate or more than 5mm, the thickness edge shall be thinned according to the requirements of Figure 2

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