Is it better to round the cylinder first and then weld it, or weld it first and then round it?
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Should the cylinder be rounded first and then welded, or should it be welded first and then rounded? Our company always welds first and then rounds it. During welding, the two sides are basically flush. It is said that it is easy to weld, but I think it causes stress, which is not good for the cylinder, and the gain outweighs the loss. There is also no heat treatment after welding. For example, the specifications are diameter 1000, thickness 5mm, Q345R material.
As an outsider, I’ve seen that most of them are first rounded using a rolling mill and then welded!
Roll the basic circle first, weld it well, and then roll it into a round shape. , if you don’t roll it first, how can you connect it? It will deform during welding. How can it become round if it is not rolled after welding?
Usually, the process is blanking → rounding → longitudinal seam welding → rounding → non-destructive testing.
The general process is: cutting - rolling - assembling - welding. According to the conditions you mentioned, the cylinder may be spliced first and then rolled. This is no problem. As long as the welding materials are used correctly, the mechanical properties of the weld are higher than those of the base metal. The plate you are using is low alloy steel, with a thickness of 5mm and a cylinder diameter of φ1000. It is cold rolled and calibrated. The stress generated by the rolling is basically released during welding.
You overestimate the capabilities of the plate bending machine. The edge of the plate cannot be rolled by the plate rolling machine and cannot be rolled into a curvature. The thickness of 3, 4, 6 and other thicknesses can be directly attached to the roller and hammered to create a curvature, which is just a curvature. Thin plates, for example, less than 20mm, firstly, in order to save material, secondly, it is not necessary, generally do not increase the amount, the rest of the roll is almost the same, the edges of the plate are flat, start welding, after the welding is completed, the campus.
Let me post a picture. What I mean is that it could have been rounder when rolled first, but the welding point was deliberately made straight. Is this necessary?
This can reduce the pressure head of a process
Agree with the 4th floor's point of view, it depends on the level and responsibility of the plate bending machine master. Generally, the plate rolling machine masters in machinery manufacturing plants or large installation companies are fine, but the machine repair workshops of user units are not very good.
Agree with the 4th floor's point of view, it depends on the level and responsibility of the plate bending machine master. Generally, the plate rolling machine masters in machinery manufacturing plants or large installation companies are fine, but the machine repair workshops of user units are not very good.
This is helpful for welding, and there is no problem if it is within 5-30mm.