Precautions For Welding Of Ductile Iron Pipes

1. Check the stress, deformation, ease of operation, thickness of the weldment, welding position and diameter of the electrode to prepare the corresponding groove.

2. Use flame to grill both sides of the part to be welded, so that all the oil that penetrates into the outside of the base body is volatilized until there is no smoke.

3. When welding, the arc should be low, the arc should be pressed quickly to avoid the arc, and the arc should not jump left and right to make the weld shape narrow and reduce the thermal stress area, which will make the ductile iron pipe connection high.

4. Use short arc and short seam welding, and the length of the welding seam should not be 60mm; adopt intermittent segmented welding, weld a certain distance, and then weld the next section; adopt the temperature between multi-layer welding layers to be controlled at 60~80 °C, and Try to make the next layer of welding seam on the fusion line of the previous layer of welding seam; inspect it in time when welding, if you find pores, slag inclusions, welding lumps, etc., you should immediately grind the weld by hand grinding to clean the weld before welding the next layer. layer.

5. When the weld is red and hot, tap the weld with a small hammer until the weld becomes dark, to roll out the weld, relax the stress and squeeze the stingy hole, and at the same time refine the grains in the weld area.