The telescopic arm is welded by channel steel and steel plate. Then the channel steel is inclined and the guide is not good enough. Is it a special profile? What are the telescopic arms?
As for the welding standards, it is difficult to say, because this practice itself is a non-standard, it is difficult to have national standards, industry standards, and even enterprise standards
Steel welding steel mostly used as a beam or a column, the steel plate is relatively thick, and the channel has been forming calculation immunity anti disturbance capability is greatly improved, two only in the center position of weld line position, the formation of the moment theory on the bending of the analysis should be small and therefore, whether it is welding crack or welding deformation can better handle. In no case have to supply square, to be.
You think, is certainly the square and thick wall, to ensure the overall stiffness and strength.When the channel steel is welded together, how can the weld be treated? If the welded joint is too high, it will affect the expansion of the inner and outer walls Flat and can not, and it can not be welded inside, how to ensure that the intensity?In order to save money by not crane factory this rough steel welding method, and crane safety first, but once the problem is not trivial, does not rule out a small factory dare to do so, but definitely not the formal business.This kind of profile is formed at one time without any subsequent welding. It is a pressing forming sleeve with cold drawing technology!
