How to distinguish between good and bad processing of large steel frames

How to distinguish between good and bad processing of large steel frames?

(1) From the perspective of the company's scale, the larger one is relatively strong.

(2) From the company's own mechanical equipment: see if they have large gantry milling machines, large CNCs, frame welding, boring machines, etc.

(3) Judging from their influence: Appropriate local investigations to see if they are one of the most powerful large-scale machinery processing plants.

(4) Check how long their company is and whether they have rich experience in large steel frames welding and fabrication!