Research Article
Quality Prediction and Control of Assembly and Welding Process for Ship Group Product Based on Digital Twin
Table 1
The quality defects of ship group products.
| Type of defect | Quality characteristic | Qualitative factors |
| Assembly defects | Deformation | (1) Positioning method; (2) assembly sequence; (3) welding parameters | Size deviation | (1) Assembly margin; (2) assembly compensation amount; (3) positioning method | Surface welding defects | Porosity | (1) Welding current; (2) welding speed; (3) welding voltage; (4) the groove is not clean | Slag inclusion | (1) Slag not cleaned; (2) groove form; (3) welding current; (4) welding speed | Incomplete penetration | (1) Welding current | Incomplete fusion | (1) Groove type; (2) assembly clearance; (3) wire feeding speed; (4) welding current; (5) electrode diameter | Bite edge | (1) Welding current | Welding tumor | (1) Welding voltage; (2) welding current; (3) wire feeding speed; (4) welding speed | Welding pit | (1) Welding speed; (2) welding current; (3) welding voltage | Internal welding defects | Wormhole | (1) Welding speed; (2) welding current; (3) welding voltage; (4) welding material; (5) base metal thickness | Lack of penetration | Kissing bonds | Hooking bonds | Cracks |
|
|