How to control local welding deformation of metal vertical storage tank bottom

In order to prevent deformation of the bottom of metal vertical storage tank during welding, the construction measures of strict control group on geometric dimension, reasonable welding procedure, process control welding deformation and rigid fixation are adopted during welding. The specific methods are as follows:

1. Strictly control the groove forming of tank weld
To ensure the geometric dimension and weld welding of the group are well welded, before hoisting and laying, the edge of all metal vertical storage tank planking shall be cleaned by grinder, and the flatness of the plate shall be guaranteed in accordance with the design requirements.

2. Strictly control the weld joint size of the tank
When assembling the bottom plate of metal vertical tank, measures must be taken to strictly control the size of the group. After placement, temporary fixed clamps shall be used to fix the adjacent planks to prevent the position movement caused by collision when the group is facing other baseplates.

3. Make sure the welding sequence of tank bottom plate
Welding sequence of metal vertical storage tank shall be conducted according to the procedure required by welding scheme. Spot welding shall be consistent with the formal welding requirements, and non welded welding shall not be conducted. When welding the long seam, edge plate butt joint and tortoise joint, back bar shall be added to prevent deformation.

4. Reasonable distribution of welders
During welding of metal vertical storage tank, reasonable distribution of personnel and welding position shall be made according to the actual situation of welding personnel, and welding shall not be allowed at will.