The above symbols should be put in the proper position of film, and the distance from weldedge should be at least 5mm (see picture3).
上述定位标记和识别标记均应放在胶片的适当位置，并离焊缝边缘至少5 mm(图3)。
2
The edge condition of strip steel is the main factors affect pipe forming and weld quality.
钢带的边缘状况是影响焊管成型和焊接质量的主要因素。
3
Detecting the weld line and its edge directly by visual sensor can achieve much useful information, which is very important in the research of weld line automatic tracking.