Linyi Mingsong Hardware Tools Co., Ltd.
What are the welding characteristics
Jul 04,2025
(1) Root welding, due to the influence of the gravity direction of the molten pool, makes it difficult to control the temperature of the molten pool. Generally speaking, the upper groove temperature of the root weld seam is the lower groove temperature, so there is a slight downward trend in the weld seams on both sides during root welding.
(2) Welding seam filling and cover welding, because the spatial position of the weld seam is at a 45 degree angle to the horizontal plane, and the molten pool is subject to gravity, the shape of the molten pool, and the geometric dimensions of the weld seam during welding are difficult to control. Generally, the upper end of the weld seam is concave and the lower end is convex, and the surface of the weld seam is rough and uneven. Therefore, welders must closely observe the shape and temperature changes of the molten pool during welding, choose the correct welding speed and transportation method, control the arc initiation and extinguishing time of the welding rod, increase or decrease the surface tension of the weld pool, prevent the weld pool from falling off, and thus obtain better surface quality of the weld seam.
(3) The welding of the weld seam cover must be carried horizontally along the inclination angle of the weld seam, otherwise it will be affected vertically downwards by the gravity of the molten pool, promoting the reduction of the weld pool. The sinking speed makes it easy for the upper part of the weld seam to have undercutting, while the lower part is prone to defects such as lack of fusion, weld bead, and slag inclusion.
