A certain user purchased a total of 12 diaphragm pressure gauges, and during use, two of the gauge connectors cracked in the center.
Root cause analysis:
The upper and lower connecting bodies of the diaphragm pressure gauge were originally fastened with 6 or 8 screws. Later, drawing on the style of foreign diaphragm pressure gauges, some diaphragm pressure gauges were changed to connect the upper and lower connecting bodies by welding. After welding, the welded connecting body was rounded with a knife. After this improvement, the outer diameter size of the connector is temporarily reduced, and secondly, it has a more attractive appearance and is more popular among users.
Why did only 2 of the 12 meters in use have welding problems with their connectors? Preliminary analysis suggests that there may be three possible reasons:
1. There may be some problems with the welding of the upper and lower joints. If the welding is not firm, it is very likely to open from here under high pressure.
2. After welding, a cut should be made to the outer circle of the joint. If the outer circle is too deep, the weld will be too shallow, and under high pressure, it is very likely to open the weld from here.
3. For gauges with high pressure above 40MPA, this structural design may have certain hidden dangers, that is, under high pressure, it is very likely to weld from the welding point.
Clear responsibility:
Based on the above analysis, the occurrence of welding failure in the instrument is due to certain problems in the product design and processing of the instrument manufacturer.
Improvement measures:
1. Because the welding of the joint mainly occurs on diaphragm pressure gauges with a pressure of 40MPA, the upper and lower joint forms of welded diaphragm pressure gauges with a pressure of 25MPA or above have been improved by changing from side welding to top welding, and slightly increasing the chamfer of the weld to ensure its welding strength.
2. For the welded joint on the original side, the processing size of the weld bevel angle should be ensured; When welding the outer circle of the car, it is necessary to ensure that the size of the outer circle is not less than the specified size.
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