Copy copy method: first the ground sampling method are assembled

into a single structure, and position of welding,


Then turned as the replication membranes, in which a single structure assembly.Applicable to cross section are symmetrical truss structure.


(21) vertically installed: according to the characteristic of component parts and stable position, choose a top-down or bottom-up assembly, adapted to be placed stably, height is not the structure.(22) lying supine position: component placement assembly.For section but not long slender member.(23) fetal membrane assembly of law: the component parts in fetal membranes positioned in its assembled position assembly.Used in the manufacture of components of large quantities of products with high accuracy.(24): using electric arc welding electrode and the work piece the electric arc generated between hot metal fusion process is called electric arc welding.Electric arc welding manual welding, automatic welding, automatic welding and gas welding of.(25): resistance welding current through contact with two welding parts, the contact resistance maximum current through the high temperature produced, so that the material in a molten state, the pressure, and fusion.Generally used for butt welding steel plate or spot welding.(26): electroslag welding current through the slag produced by thermal resistance to molten metal welding.As for box column and Liang Gang with the column connecting beam upper and lower flange stiffening plate welding.(27) manual welding: all manual electric arc welding, low efficiency, quality to rely on their own, poor stability, but flexible, suitable for short and complicated weld or site welding.(28) automatic submerged arc welding: welding arc buried in the welding powder below, the mechanical automatic sprinkling and sends the mobile welding wire flux.For a longer weld.Good welding quality, high efficiency.(29): CO2 or gas protection welding argon arc welding molten metal, the wire and gas sending are automatic, only manually move the torch.Is a semi-automatic welding, good welding quality, high efficiency.(30): shot blasting the particle diameter of 0.8 ～ 2.0mm steel by throwing machine impeller suction impeller tip in the center, directional high-speed throw, at the need for anti-corrosion treatment of the surface of steel structure, to achieve mechanical descaling purposes. This method high rust removing efficiency, low cost, less pollution.Anticorrosive measures of the steel structure (1): corrosion resistance of weathering steel is better than that of the general structural steel steel called weathering steel, generally containing phosphorus, copper, nickel, chromium, titanium and other metal, the metal surface layer of protection, in order to improve the corrosion resistance of.Low temperature impact toughness than the general structural steel.Standard for welded structure for "steel" (GB4172-84).(2): galvanized hot-dip galvanizing is rust steel immersed in 600 ℃ high temperature melting zinc liquid, so that the steel member is attached to the surface of zinc coating, zinc layer thickness on the 5mm plate shall be not less than 65 μ m, the plate is not less than 86 μ M.In order to anticorrosion aim.This method has the advantages of durability life long, the production of the high degree of industrialization, stable quality.It was heavily used by atmospheric corrosion is serious and difficult to repair for outdoor steel structure.Such as a large number of transmission tower, communication tower.In recent years, the emergence of a large number of light steel structure system of steel plate and so on.More also use hot-dip galvanized anticorrosion.The first process of hot dip galvanizing is pickling, and then is washed.The two processes are not completely to stay hidden corrosion.So we must completely.Steel structure for the designers, should avoid to design a joint surface component, so as to avoid the abutted surface cracks in pickling is not complete or acid wash net.Cause the galvanized surface of yellow water flow phenomenon.Hot dip galvanizing is done at high temperature.The tubular member open at both ends should be left to their.If the ends are closed will cause the air inside the tube expansion and the head plate burst, thereby causing safety accidents.