China's current construction market to use HF Welder the steel connection methods are: steel banding lap, mechanical cold extrusion connections, steel resistance welding, steel flash butt welding, steel arc welding, steel bar electroslag welding, steel gas pressure butt welding, embedded parts Steel submerged arc pressure welding, threaded pipe connections. At this stage the most important methods used are: lap, flash welding, electroslag welding, pressure welding and threaded connections and other methods of reinforcing steel connection. In this case,
For the above several commonly used steel connection method, the overlap method is not discussed with the elimination method; flash welding qualified rate is the lowest, about one-third of unqualified; electroslag welding times low, especially after welding ESW welding, Qualification rate is too low can not do testing test, so the electroslag welding can only be used for vertical welding of steel, can not be used for welding in other directions. The highest rate of qualified air pressure welding, fully able to achieve 100 percent pass rate; several welding methods, the cost of the highest thread connection method, about 20 times the cost of air pressure welding. If the calculation of electricity consumption, air pressure welding method costs about 0.3 yuan / head or so, if not calculate the electricity consumption, flash welding the lowest cost. If the investment from the device to see: the minimum input cost is a threaded connection, and some thread casing equipment manufacturers as a result of high cost of threaded casing joints, so leased to the user free of charge steel buckle machinery. Followed by pressure welding into the cost of small. Because flash welding and electroslag welding are required with a large welding machine, the input cost is followed by flash welding, electroslag welding. In this case,
From the above characteristics of the use of several devices, the flash welding welding operation is simple and easy to grasp, low cost of steel joints. Shortcomings can only be used for horizontal welding of steel, equipment, larger, mobile inconvenience, a narrow space or no crane can not be constructed, the joint pass rate is low, large power consumption; welding slag welding is characterized by lightweight, Convenient, easy welding operation, the joint cost is low. The disadvantage is that the vertical welding can only be used for reinforcement, need to be equipped with large welding machine, power consumption; thread connection method of operation is relatively simple, environmentally friendly equipment construction. The disadvantage is that the connector cost is too high. Pressure welding is characterized by the ability to weld horizontal, vertical, arbitrary direction of the steel, reinforced joints qualified a higher rate, easy to move smaller fixture, joint low cost, small equipment investment. The biggest drawback of pneumatic welding is the technical requirements for the operation of workers higher, the quality of welding by the workers in the technical level of a greater impact. However, the Ministry of Construction in 2003 promulgated the "Reinforcement Welding and Acceptance Rules" home page, which Article 4.6.2 of the gas welding welding method requirements: In recent years, due to the success of melt pressure welding and application, add the provisions of this article . The use of melt pressure welding, can simplify the end of the processing of steel demanding requirements, easy to operate, ergonomic high, so the provisions in the general case, should be preferred. According to the site site trial and error, this new melt pressure welding process is indeed more common than before the use of solid-state welding method is easy to grasp, and eliminates the need for grinding the end of the process, not only simplifies the operation process, A substantial increase in welding speed, a thorough and effective solution to the operator of the technical requirements of higher issues. In this case,
Japan has a certain understanding of the construction steel connection method, the highest rate of gas welding, so Japan is about more than 70 percent of the use of air pressure welding method. Many users of large companies in the country, after contrast test commonly used welding method of steel welding, welding all the advantages and disadvantages of welded steel, the conclusion is that the overall pressure welding welding efficiency is better. In summary, the construction of steel welding method, the pressure RF Welding method of integrated characteristics of the better.