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Bookmark or Share- Undoing ultrasonic welds? - Plastics Engineering general ... - Eng-TipsGood welds create an integral product. It is possible, though, that if the two halves are poorly welded or are of dissimilar material, that the weld is purely mechanical at the joint, perhaps there is a solvent that can infiltrate the porosity at that joint and dissolve the weld before the more dense portions of the whole part.
- Specifying pH Value in HYSYS - Chemical plant design & operations1) Is it possible to specify pH value of a given stream within HYSYS flowsheet, in the same way that temperature, pressure, flow and composition are being specified? 2) When defining stream composition, input of 99% H2O and 1% H2SO4 does not come up with any pH value as the result. Why is that...
- preheat & post weld heat treatment of SA-387 Gr 11 Class 2 ... - Eng-TipsI understand Section UCS covers the post weld heat treatment requirements. My concern is any required preheat for welding and if that preheat has to be maintained until the weldment enters the furnace for PWHT. This I undersatnd has been required or recommended for certain chrome-moly grades to prevent cracking of the welds.
- API 6A PSL3 Material Requirements - Eng-TipsDoes anyone know if it is possible to qualify API 20th edition material to 21st edition? PSL3. I use mainly 4130 alloy and 17-4 HH1150. I am starting to see some material come up that meets 21st edition PSL3 but I am afraid the availability will be slim when November hits. Also, can someone...
- Pickling & Passivation - Pipe weld inside 1 - Eng-TipsAs stated in the ASTM A380; stainless steel has a very thin and stable oxide film rich in chrome. This film reforms rapidly by reaction with the atmosphere if damaged. If stainless steel is not adequately protected from the atmosphere during welding or is subject to very heavy grinding operations, a very thick oxide layer will form.
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