Views: 0 Author: Site Editor Publish Time: 2025-01-16 Origin: Site
Main reason: the Angle and position of the welding wire and the tank wall are incorrect.
Solution: The correct shape of the bottom weld, under normal circumstances, the distance between the welding wire and the root is 5mm, and the root is the best forming.
Main reasons: A. The Angle between the welding wire and the tank wall is less than 55 degrees
B. The gap between the wall panels is large (generally zero, but it is impossible to achieve in construction)
C. The welding wire is too close to the root
D. The welding current is too large
Solution:
A. Adjust the Angle and position of the welding wire according to the specified value
B. Adjust the current and voltage values according to the specified values, and make fine tuning in the welding process.
C. For the root joint with a gap greater than zero, when the gap is less than 1mm, due to the copper pad on the back, if the Angle and position of the welding wire are suitable, it will not cause burning through. When the gap is more than 1mm, it must be manually welded on the front to fill the gap and clean the root and slag treatment.
Main reason: Due to the deformation of the steel plate, the position of the welding wire often changes during the welding process. The position of the welding wire is not correct, and the position of the welding wire is an important reason that affects the appearance defect of the transverse seam.
Solution: The position of welding wire is the key to good appearance forming.
A. Apply the guide needle correctly and adjust the position change in time
B. Observe the welding forming in time, and adjust the specification or the position of the welding wire in time
Occurs between the weld layer and between the weld and the base material, the cause:
A. The welding wire is too far from the root
B. The current is too small or the voltage is too low
C. Welding speed is too fast
Main reason: there is water in the weld, and there must be pores inside the surface of submerged arc welding when the surface pores occur.
Solution:
A Before welding, it is necessary to clear the moisture, rust, and other debris in the groove gap
B Flux must be dried, must be recovered after welding, and must not be placed in the welding machine overnight
C In the welding flux protective layer can not be too thin can not be too thick: welding protective layer is too thin, can not fully play a protective role, too thick when the internal gas is not easy to escape, which can cause porosity.
The main reasons are:
A The position of the welding wire is far from the root
B The opposite gap is large, and the welding slag is removed when manually filling the joint
C Back weld please root incomplete
D Welding voltage is too low
