Ten key points for purchasing Automatic butt welding machine
When purchasing products, we need to consider purchasing them comprehensively. Today, I will show you how to purchase a qualified Automatic button welding machine. Here are ten points to share with you.
1. Understand the company's strength, whether it is independent R&D and production, whether it has technical strength guarantee, and provide guarantee for future equipment maintenance, equipment detection and calibration, system upgrade, and whether it can buy equipment accessories, so as to solve users' worries.
2. Understand whether there is after-sales service and relevant service measures, whether there is a nearby service network or whether there is a quick solution for a nearby service network, and relevant emergency measures.
3. Whether the basic three elements "pressure, time and temperature" of a qualified Automatic BUTT Welding Machine are accurate, whether the displayed value matches the actual output value and whether it meets the requirements of national standards. (The total welding pressure is equal to the drag pressure plus the theoretical welding pressure; the crimping time, heat absorption time, switching time, gradual rise time and cooling time should meet the requirements; the surface temperature difference of the heating plate should be less than or equal to plus or minus 3 degrees.) As manufacturers have relevant instruments to detect pressure and temperature, if you go to the manufacturer to purchase equipment, you can propose to let the equipment manufacturer demonstrate how these three elements are detected and calibrated on site.
4. Pay attention to whether the action of the oil cylinder is slow in the rising butt joint stage after the heating plate is extracted, which is also an important stage to ensure a qualified weld crater. If it is too fast, it will cause impact on the weld crater and form a false weld.
5. Whether the cross section identification of the oil cylinder of the equipment is marked on the machine body or found in the instruction manual is an important parameter for calculating whether the welding pressure is consistent with the national standard, and it is also an important parameter for checking whether a qualified manufacturer really understands the authenticity of the welding process.
6. The number of replaceable slips of Automatic butt welding machine is mostly 3 layers, which is also required by the national standard. If the combination of multi-layer slips is used, the welding quality cannot be guaranteed. The more layers of slips, the greater the cumulative error and the greater the pressure loss on the weld junction.
7. Whether the Automatic button welding machine has the functions of temperature compensation, online real-time monitoring of output pressure, and alarm prompt in case of discrepancy between actual output and parameters.
8. The appearance of a qualified crater shall have a smooth and symmetrical welding ring along the entire outer circumference of the pipe, and the welding ring shall have a certain degree of symmetry and alignment. The ring size of gas pipeline shall be controlled according to the following geometric dimensions to ensure the quality of welded junction.
Width of ring=(0.35-0.45) * wall thickness
Height of ring=(0.2-0.25) * wall thickness
Height of circumferential seam=(0.1-0.2) * wall thickness
9. In terms of equipment price, there are 30000 to more than 100000. There are imported products with original packaging, as well as joint venture assembled products in the market. Several domestic full-automatic products have been made. The product prices vary greatly. When choosing a welding machine at what price, the output accuracy of the equipment itself should be put in the first place. If the parameters are inaccurate, it will lose the significance of using a fully automatic welding machine. Then compare the difference between materials and hydraulic valves, sensors and control systems. For example, the price of a pressure sensor ranges from hundreds to thousands. The selection of materials and standard parts directly affects the stability, output accuracy and service life of the system.
10. Automatic products and programmed products generally have faults, which can not be repaired by field users. So you can't buy a machine with poor quality and unstable system in order to save money. Otherwise, the loss you will spend on maintenance and delay will be greater than the price difference. At present, most users are still using hydraulic hot-melt welding machines, and the quality of welding depends entirely on the quality of the machine and the skills of the operators.