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Anonymous users2024-02-08The differences are as follows: 1. The quality is different: the higher the level, the higher the welding quality requirements for the welder, and the quality of the second level is higher than that of the first level.
2. The process is different: if the first-level shooting is unqualified, the second-level shooting needs to be replaced, which is relatively more troublesome.
3. Accuracy.
Different: The results of the second level are more detailed and accurate. Usually, it is decided to pass or fail at one time, but there are also those who choose to shoot multiple times.
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Anonymous users2024-02-07The higher the level, the higher the welding quality requirements for the welder, the quality of the first level is higher than the second level, and the flaw detection company has its own set of evaluation criteria to assess how many levels your welding weld belongs to.
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Anonymous users2024-02-06The higher the level, the higher the welding quality requirements for welders, and the quality of the first level is higher than that of the second level.
The weld of the X-ray film requires the slag inclusion and porosity inside the weld to be controlled within the specification requirements, which exceeds the X-ray film, that is, the X-ray film is unqualified. It's okay to fail once, but you need to change the board after the second time.
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Anonymous users2024-02-05The quality level and defect rating are determined according to the standards tested. The standard for 4730 is as follows: The general quality rating is: Grade 2 is not allowed to have cracks, unfused, and unpenetrated defects.
The connection method between pipe-to-pipe couplings, pipe couplings, valves, and inlet and outlet pipes on equipment is determined by factors such as the nature, pressure, and temperature of the fluid, as well as the material, size, and installation site of the pipe.
Threaded connection: mainly suitable for small diameter pipes. When connecting, it is generally necessary to wrap fluoroplastic sealing tape or thick paint, hemp wire and other sealing materials in the threaded connection part to prevent leakage.
When the pressure is above MPa, a gasket is generally added to the end face of the pipe. This connection method is simple and can be disassembled and reassembled.
Considerations:
Determination of Pipe Diameter When the flow rate of the fluid is known, the size of the pipe diameter depends on the permissible flow rate or the permissible frictional resistance (pressure drop). When the flow rate is large, the pipe diameter is small, but the pressure drop value increases. As a result, when the flow rate is high, the investment in pipeline infrastructure can be saved, but the operating energy cost of power equipment such as pumps and compressors increases.
In addition, if the flow rate is too high, there may be some other disadvantages that can be presented. Therefore, the pipe diameter should be determined according to the comprehensive consideration of construction investment, operating costs and other technical factors.
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Anonymous users2024-02-04Summary. Quality ratings and defect ratings are based on the criteria you are testing. The 4730 standard is as follows:
The general quality rating is: Level 2 is not allowed to have cracks, unfused, and unpenetrated defects. There is also according to the nominal thickness of the pipe you weld to determine the allowable circular and strip defects, according to the different thicknesses, the allowable secondary circular defect points are:
The maximum length of a single point of the second level of the bar defect is less than or equal to one-third of the thickness, and the minimum is 4But the maximum cannot exceed 20For a group of strip defects, the cumulative length of any group of strip defects with an interval of no more than 6t in any selected strip defect assessment area with a length of 12t shall not exceed t, but the minimum can be 4
Quality ratings and defect ratings are based on the criteria you are testing. The 4730 criteria are as follows: The general quality rating is:
The second level is not allowed to have cracks, unfused, and unpenetrated defects. There is also according to the nominal thickness of the pipe you weld to determine the allowable circular and strip defects, according to the different thickness, the number of secondary circular defects that are not allowed are points, the maximum length of the second level of bar defects is less than or equal to one-third of the thickness, and the minimum is 4
But the maximum cannot exceed 20For a group of strip defects, the cumulative length of any group of strip defects with an interval of no more than 6t in any selected strip defect assessment area with a length of 12t shall not exceed t, but the minimum can be 4Hope!
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