How to choose closed steel grating?

Is there any quality requirement for the welds on the weld?

Most of the closed steel grating are now welded by machine, even if the machine can not do without manual welding. The finished products produced by machine welding are to be manually welded by cutting, wrapping and wrapping. What are the quality requirements for welds of steel grating?

According to the regulations, if the weld is to be measured, a certain amount of X-ray or ultrasonic inspection of the weld internal, and assessment.

1. The straightness of weld should be between 100mm-2mm.

2. The transition of welds should be smooth and the transition angle should not be greater than 90 degrees.

3. The height difference of weld is 25mm, and the height difference should be less than 1.5mm.

4. The tolerance of K value of fillet weld is 0.9K0 < K < K0 + 1 when the thickness of the object plate is less than 4mm and 0.9K0 < K < K0 + 2 when the thickness of the object plate is more than 4mm. (K0 is designed for solder pin size).

5. Seam undercut: when the thickness of the plate is less than 6 mm d < 0.3 mm local, d < 0.5 mm; when the thickness of the plate is more than 6 mm d < 0.5 mm (d is undercut depth)

6. The weld is not allowed to be lower than the surface and cracks of the workpiece and not yet melted.

7. The undercut depth of multi weld seam stack should be less than 1mm.

8, if there are welding defects can be repaired, but after repair must polish and smooth.