Seamless tube stamping processing, prone to mucosal and slip defects. The reason for the folding is due to the pursuit of high efficiency of the manufacturers, the amount of depression is too large, resulting in the ear, the next rolling to produce folding, folding products will crack after bending, seamless tube strength decreased. The reason is that its blank is adobe, adobe pores and more adobe in the cooling process due to the role of thermal stress, resulting in cracks, after rolling there are cracks. Cold cutting machine tonnage high, cut the end of the surface smooth and tidy, and pseudo-poor material due to poor quality, cutting the end of the face often have the phenomenon of meat, that is uneven, and no metallic luster. And because the false product manufacturers cut off the small head, head and tail will appear big ears. These defects should be completely removed, after the removal of the wall thickness and diameter should not exceed the negative deviation. In the removal of defects to ensure that the seamless tube wall with a corresponding thickness, there is no difference in thickness, to ensure that the seamless tube with a high quality assurance.
Oil cracking pipes arc welding basic operation technology using contact arc method arc, there are two kinds of brushing and direct hit method. Draw the first method of the electrode at the arc, the wrist to twist it, like the match matches the electrode in the arc at a slight scratch about 20mm length, and then lift the height of 2 ~ 4mm ignition arc. Its characteristics are: easy to damage the surface of the weldment, easier to master, generally applicable to alkaline welding rod. The first hit the electrode at the arc, the wrist under the bend, so that the electrode gently tapping the workpiece, and then lift the height of 2 ~ 4mm ignition arc.
