Please help, how much does the pipe head actually extend?
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What does the second half of the sentence mean? If you want to retain the complete welding end, the extension length should be appropriately increased according to the outer diameter, wall thickness and welding process of the heat exchange tube. Please give me some guidance
The distance between the outer sides of the tube sheets is 2992, and your heat exchange tube should be 3000. 4mm is exposed on both sides for easy welding. Similarly, the heat exchange tube is given as 3000. When you design, the distance between the outer sides of the two tube sheets is 2992, leaving a length of welding fillet weld.
Reserve the weld height, please take a complete picture.
As mentioned on the 2nd floor, for example, the distance between the outside of the tube plate is 2992 and the total length of the heat exchange tube is 3000. At this time, the heat exchange tube at one end is exposed 4. Weld according to the welding process (the outside of the tube plate is the tube side). However, if only this small length is left, there is a high probability that the tube end joint cannot be completely preserved. structure (that is, the welding leg will wrap the pipe end during welding), so the standard meaning is that if your equipment needs to preserve the complete end of the heat exchange tube, then increase the extension length appropriately according to the outer diameter, wall thickness and welding process of the heat exchange tube, for example, add 4 to 6...
This is estimated to be the pipe mouth welding in GB151, which means that if the pipe end is too small, the pipe head will be completely or partially melted during the pipe mouth welding. Sometimes if you want to leave a complete pipe head, you need to lengthen the pipe extension according to the actual situation to avoid being welded.
However, the protrusion marked on the blueprint is 2 or 2.5mm. During actual welding, it is usually longer and reaches 4-5mm. The pot inspection center said it does not match the drawing and opened a contact sheet. How to solve this problem?
However, the protrusion marked on the blueprint is 2 or 2.5mm. During actual welding, it is usually longer and reaches 4-5mm. The pot inspection center said it does not match the drawing and opened a contact sheet. How to solve this problem?
This is a contact form. According to the actual exposed 4 or 6, ask the production unit to issue a technical contact sheet, and the design unit will check and review the design and the person in charge will sign it, and you should be fine.
The overhang of the tube head is usually due to the length allowance of the heat exchange tube. This needs to be cut when threading the tube to make it suitable and flush. Just meet the drawing requirements and the quality can be guaranteed.