Quality requirements
5 When the mesh reinforcement on both sides of the beam is different， the reinforcement on both sides extends into the beam， and the reinforcement anchorage length is required.
wEscherichia coliIn order to make the welded pipe have the required mechanical， physical and chemical properties， in addition to the reasonable selection of materials and forming process， heat treatment process is often necessary. In addition，Products Show the mechanical，SantiagoAlloy pipe 12Cr1MoVGWhy interest rates continue to rise copper， magnesium， titanium and their alloys can be changed by heat treatment to obtain different service properties.
Whether the mesh size and wire diameter of electric welding mesh meet the standards
Lcounterfeit Welded steel mesh， a new form of reinforcement， is especially suitable for large-area concrete engineering.
Yl According to the purpose， the welded pipe has general purpose and high temperature and high pressure. The pipe used in the latter is often special alloy steel. The problem of shrinkage cracks in the welding process and the mechanical properties of the pipe in the heat affected zone must be considered and solved， and the mechanical properties of the pipe in the heat affected zone will not be greatly changed due to the influence of welding operation.
The first is people. Human factors are the control focus of welding. Therefore， before welding， welders with skilled technology and welder certificate shall be selected for necessary technical training and disclosure. It shall not be replaced at will to ensure the relative stability of the welders welding the pipeline.
A major defect is its instability to the corrosion process，Products Show which can not resist all factors. Producers need a solution that can solve the corrosion problem. The decision has been found. They become a galvanized steel pipe.
o Remove defective pipes within the allowable length.
KStretch punching by steel plate equipment; The main purpose is to be used in the structure of scaffold.
DManagement Department Pipe installation:
vKThe first is people. Human factors are the control focus of welding. Therefore， before welding， welders with skilled technology and welder certificate shall be selected for necessary technical training and disclosure. It shall not be replaced at will to ensure the relative stability of the welders welding the pipeline.
Galvanized pipe is a layer of galvanized ordinary steel. This is a layer and is a great anti-corrosion protection.
Galvanized pipe cleaning， east-west derusting， pickling and shot blasting
Service firstv As long as the pipe material is high-strength alloy steel， including alloy steel pipes with temperature resistance， pressure resistance， wear resistance and low temperature resistance， the welding process shall be focused on preventing the tendency of martensite structure and cracks due to welding high-temperature operation. The general process requirements are that the welding rod shall be selected and baked as required and sent to the welder for use. The oil and water shall be removed before welding on both sides of the weld Rust and sundries shall be removed and cleaned. The welding line energy shall be as small as possible to minimize the swing during the welding process. The arrangement of the last weld shall have annealing effect on the heat affected zone as far as possible. Slow cooling after welding， cover with asbestos cloth，Products Show etc.
N Mixed pass system. According to the characteristics of rolling mills and products， in order to give full play to the advantages of their respective systems and overcome their disadvantages，SantiagoAlloy pipe 12Cr1MoVGWhy interest rates continue to rise mixed pass system is often adopted， that is， the combination of more than two systems. For example， straight leg cross rolling pass system is adopted for finished hole and front hole of finished product， and bent leg cross rolling system is adopted for other passes; or direct rolling system is adopted for rough rolling hole and straight rolling system is adopted for the last ~ finish rolling holes Leg oblique tie hole， etc.
Metric welded pipe: it is used as seamless pipe in standard. The welded steel pipe expressed by outer diameter * wall thickness mm is welded by hot and cold strip welding of general carbon steel high-quality carbon steel or Puneng low alloy steel， or it is made by cold drawing after hot strip welding. Metric welded pipe is generally used as structural parts， such as transmission shaft，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd or to transport fluid. The thin wall is used to produce furniture and lamps. It is necessary to ensure the strength and zigzag test of steel pipe.
aEscherichia coliIn building construction engineering， welded steel wire mesh is an essential heat preservation and crack prevention material. It has good performance and can take into account the unity between crack resistance and the requirements of face brick for base strength and the stability of heat preservation system.
tFLongitudinal welded pipe has the advantages of simple production process， high production efficiency， low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can produce welded pipe with larger pipe diameter with narrow blank， compared with the straight seam pipe with the same length， while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing and the production speed is low. Welded pipes with large or thick diameter are generally made of steel blank directly， wire drawing is OK. Welded pipe is welded with strip steel， so it is not as high as seamless pipe in its original position. Welded pipe process: uncoiling of raw materials - leveling - end shearing and welding - looper - forming - Welding - removal of internal and external weld beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - Inspection (strict control) - Packaging - delivery.
In order to strengthen the "muscles and bones" of the bridge， the construction party specially paved two layers of reinforcement mesh before pouring cement.