Then start to weld flanges. First, assemble the cone and the big flange according to the drawing, and then divide the big flange into 8 equal parts. Because the flange is thick and the groove is large, symmetrical section and multi-layer welding are adopted. Finally, it is required that the weld strength should at least reach the parent metal strength. The weld surface is flat and smooth, and there are no defects such as burn-through, porosity, weld leakages, slag, undercut and incompletely filled grooves. Weld reinforcement is less than 2mm.
As far as welded flanges are concerned, many customers question whether the quality of welding plate flanges is superior to forged welding flanges. In fact, the quality of the former is the same as that of the latter, but the quality of the material of welding plate flanges is not guaranteed. Generally, there is no problem with the density of welding plate flanges, but in the process of production, the blank of welding plate flanges is rarely tested, so the material quality is not guaranteed.