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i made the cross section examined with SEM/EDS method. and i found that there is a Ni-P plating, however, it didn't protect the body from corrosion. and i also EDS test the oxide layer on the surface, and its mainly elements is O and Fe, and its AT% is about 78% and 21%, and no S and Cl was...

mrfailure, and ED, thanks for your reply. the part has not been used in service, it was just fixed to the customer's equipment. and the time is no longer than 1 month. as for what dripping on the part, sorry, i dont know it and i guess the customer really didn't know. what i will do is as...

one more photo. the morpholoyg of oxides is unexpected to me.http://files.engineering.com/getfile.aspx?folder=05de8ced-1c3f-443d-8d5f-98f572e293eb&file=P9180084.JPG

hi, all, we have an un-abnormal corrosion happened on the surface of a SS400 plate, and i would like to ask you guys to give me an instruction on how to analyze the oxide. i will post a few photos of the oxides to you for your reference. the corrosion plate was returned from the customer and...

metengr, thank again.

as we can see that the width of crack in the outside of weld metal is larger than that of internal part of the crack. could that be a proof that there is a tensile stress which promote the propagation of the crack? according to the weld design, during welding, the internal part of the weld metal...

metengr, gtaw, thanks. always learn a lot from you. stonecold, i don't know the application of the product. but i can tell you cracking happend when it was being welded. metengr, could you give me a simple explaination on how these cracks formed, always tensile stress effect? and how delta...

crack initiated from the outside of the weld metal and propagate to the inside,as attached file shows. and also smaller crack found near the large one. it should be hot cracking.http://files.engineering.com/getfile.aspx?folder=86c83884-021e-4131-90ec-12b9380828ae&file=5_crack_500x.jpg

cross section of the weld connectionhttp://files.engineering.com/getfile.aspx?folder=95ff45b7-1057-41c1-aa48-f7ca4f162e3c&file=12_weld_design_50x.jpg

brimstoner, thanks. yes, according to my observation, i think it has no filler metal, and was welded autogenously. i know little about the welding parameters. attached is schematic of weld design, pls. check. thanks...

one more crack photohttp://files.engineering.com/getfile.aspx?folder=b7a501a3-a407-4889-9c60-3e3d0efda73b&file=1-4.jpg

hi, the customer have a hollow cylinder and stepped button (our product)welded together. both of the cylinder and stepped button are made of 316L SS. and they have a lap joint. the size of hollow cylinder is 14mm long and 0.3mm thick; and its diameter is about 9mm; our product is 2.5mm thick...

mr, yes, it could be. indeed, it is sure that there was electric arc during service.

photo of melting pinhttp://files.engineering.com/getfile.aspx?folder=49190b64-20e1-485e-b5ac-7f0acf6e18ed&file=1.jpg

mrfailure, edstainless, thanks for your reply. it is very useful. according what i know, the refrigerant is R22. and the compressors were used in train, which was located on the top of it. eds test was done, and it is shown in the attached file. the photo is in BEC mode. and the pin was...

hi, guys, i need your help. i have a terminal, there is 3 pins in it and they are made of copper core wire with jacket 446 stainless steel. the terminal was returned from one customer, and it was found that one of the pins was broken. on the broken pin's surface , i found serious corrosion as...

stan, they are uniformly distributed in it.

rp， thanks for your reply. stan, no, there are many similar structures.

sorry, i made a mistake and upload again.http://files.engineering.com/getfile.aspx?folder=6e826fa7-86d1-430d-9f4a-5887cd7bd70f&file=06_200x.jpg

hi, could anyone tell me how the unnormal microstructure form in the attached file? what i know about the material is: its grade is SAE1018, and the raw material is round bar. does that make the properties worse, any idea is appreciated.