To detectsteel structure steelwork content and method

steel structure engineering major test content: scantlings and flatness detection; component surface defect detection; detection of the connection (welded, bolted); steel corrosion detection; the fire coating thickness detection. If the steel factory certification, or have doubts about its quality, should increase the mechanical properties of the steel test necessary to detect its chemical composition. Keywords: detection Steel Engineering steel structure used in the member is generally from steel mills mass production, and the need for compliance certification, and therefore, the strength and the chemical composition of the material is a good guarantee. Engineering detected focus quality problems generated in the installation, splicing process.
A major test content, steel works: scantlings and flatness detection; component surface defect detection; detection of the connection (welded, bolted); steel corrosion detection; the fire coating thickness detection. If the steel factory certification, or have doubts about its quality, should increase the mechanical properties of the steel test necessary to detect its chemical composition.
Second, the steel structure of the application of the test specification range of knowledge
Third, each size of the detection of the component size and flatness in the three parts of the member measured, taking the average of the three as a representative value of that size. The steel member the size of the deviation should be calculated on the basis of a predetermined size of the design drawings the the size deviation; deviation allowable value should be consistent with its product standards requirements. The beam vertical steel structureplane deformation and plane lateral deformation and the deformation of the truss members, so you want to detect both directions flatness. Deformation of the column tilt and deflection of the pillar. First visual check, anomalies or doubt on the beam, truss member fulcrum tensioning a wire or thin wire, and then measuring the vertical deviation of the points; theodolite column tilt available or lead vertical measurement. The column flexural member fulcrum tighten a wire or thin wire measuring four components detection of surface defects - Magnetic Particle Testing 1, the basic principles of magnetic particle inspection applied magnetic field on the magnetization of the workpiece (only ferromagnetic material), If there is defect, the magnetization of the workpiece after its various parts of the basic magnetic properties, while the presence of defects such as cracks, pores, or a nonmetallic substance slag, since they will be on the workpiece caused by the air gap or non-magnetic gap, so that the reluctance of the defective portion is greatly increased, the normal propagation of the magnetic lines of force in the workpiece has been the barrier, in accordance with the principles of the magnetic continuity, then the lines of magnetic force of the magnetizing field to be forced to change the path of escaping the workpiece, and the leakage magnetic field is formed in the surface of the workpiece . 2, the leakage magnetic field strength depends mainly on the degree of influence of the magnetic field strength and defects for the vertical section of the magnetizing field. The use of magnetic leakage magnetic field given show or measured, to analyze the presence or absence of defects judge its position and size. The ferromagnetic material powder is sprinkled on the workpiece, is adsorbed on a position of the leakage magnetic field of the magnetic powder, thereby forming the shape of the display defect of the magnetic marks, the detected defects can be more intuitive. This method is the application of the first and most widely destructive testing methods. Magnetic Particle general industrial pure iron or iron oxide production, is usually made of iron oxide (Fe3O4) powder of fine particles as magnetic particle. Magnetic particle fluorescent magnetic particle can be divided into two categories of non-fluorescent magnetic particle, fluorescent magnetic particle in ordinary magnetic powder particles coated with a layer of fluorescent material, so that it can emit fluorescence under UV irradiation, the main role is to enhance the contrast easy observation.
Magnetic particle testing is divided into two kinds of dry and wet: dry - the magnetic powder directly sown in the workpiece surface. For ease of powder particles to roll to the leakage magnetic field, the magnetic powder particles used in the dry assay usually larger, so the detection sensitivity is low. However, when wet with water or oil contact, the test piece, such as a higher temperature, then only the wet method is not allowed in the workpiece. Wet - magnetic particle suspended in a carrier liquid (water or kerosene, etc.) formed among the magnetic suspension is sprayed to the surface of the workpiece, when the magnetic powder by means of the good characteristics of liquid flow, and can be relatively easily to weak The leakage magnetic field while moving the wet good fluidity and can be employed than the dry method is more fine magnetic powder, so that the magnetic powder and slight leak magnetic field easier by the adsorbent, and thus a steel structure detection sensitivity of the method of the wet Bigan. 3, applied to the general magnetic particle inspection program (pretreatment - magnetization - magnetic particle - Observation records) · pretreatment component surface grease, paint and rust removed, so as not to affect the magnetic particle attached to the defect. · Magnetized choice of appropriate magnetization method and the magnetization current, power, the magnetization is performed on the member.
Vibration Stress Relief equipment on the benefits of casting, welding and other components：http://structureworkshop.blogspot.com/2012/12/vibration-stress-relief-equipment-on.html