Welding equipment due to the possible tolerance pipe blank width and thickness, and the welding speed and welding temperature fluctuations, is likely to be involved in the change of welding pressure. Welding extrusion amount generally controlled by adjusting the distance between the squeezing roller, you can also use before and after the extrusion roll tube cone weeks sent to control.Is one of the main parameters of welding process, welding pressure after two edges of billet heating to welding temperature, under the effect of extrusion forming of metal grain together is mutual crystal produced by welding.
The welding pressure of the automatic welding equipment affects the weld strength and toughness. If the welding pressure is small, the metal welding edge is not fully pressing, the residue of non-metallic inclusions in weld because of low pressure discharge not easily, the decrease of strength of weld, cracking easily after stress; Stress, most of the metal welding temperature is reached by extrusion, not only reduce the weld strength, and produce both inside and outside burr is too large, or lap weld defects. So should according to different specifications of automatic welding equipment in the actual get the optimal welding stress in the corresponding. According to the experience of the practice unit welding pressure generally is 20 ~ 40 mpa.
