What are the requirements for welding thick steel plates

Thick steel plates welding requirements:
(1) Adopt cut-through welding process, and then analyze and compare to check whether the selected welding process is appropriate and the quality of the weld.

(2) If butt welds are used for thick steel plates, before welding, we must thoroughly inspect the fractures and edges of the fractures within a certain range, and check whether there are any defects in the interior.

(3) Before welding thick steel plates, preheating should be performed according to the welding process, and the temperature measurement points should be set.

(4) The number and thickness of weld layers and the temperature between weld layers must be controlled. And after each welding is completed, the corresponding insulation treatment should be performed.

(5) After the welding of the thick steel plates is completed, and after 24 hours, the ultrasonic non-destructive test can be performed, but the ambient temperature must meet the standard.