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Hi Guys, I am laser welding thin (0.5mm) 430LNT (Ti, Nb stabilized for welding) using a 2kW Rofin 1070nm fiber laser using an automated production machine. We have been playing around with applying protective gases such as Nitrogen, Argon, and Helium via Ø4mm nozzle and found that the welds are...

Hi there, Thanks for the response. Yes there was visible discoloration. I did doubt how good our setup was however would you still not expect the argon atmosphere to have less corrosion than the air atmosphere sample? And how does that explain the thin ring of corrosion? would you not expect...

Hi Guys, I am currently doing a research and development project into fibre laser welding of thin ferritic stainless steel (430LNT). 430LNT is a weldable grade of stainless which has been stabilized with Titanium and Niobium. We have had the material tested and is within the 430LNT specs of...

Hard to say for sure, I believe it has an element of both. The test we do is call the Erichsen cupping displacement test in which we deform the material until we detect a crack, see the attached image to see the process. The failure mode is the same. We do Tensile testing but our samples...

Interesting, do you have any more information on this at all or know where I could find some? Weld times are very short and concentrated, Weld speeds are around 100mm/s so you maybe right with the stabilization. The element that makes it hard to detect is that within the first hour the strength...

Samples have all been ferritic.

Hi there, Thanks for the reply. Gas has not played any role as we see it in samples of no shield gas, argon shield gas and nitrogen shield gas. I should of said before but we get this using both fibre and CO2 lasers. Regards, Roy

Hi Guys, I'm currently doing a research and development project in laser welding thin (0.5mm) stainless steel using a fibre welder (Rofin 2kW 1070nm CW) and have notice a phenomenon in which the weld becomes up to 20% more ductile as its aged over a couple of days verses tested straight away...

Fortunately no pushy MBA types are driving this project only me who is doing this as a side line project at home. I am mechanical design engineer who designs automated production lines by trade with very little experience in thermodynamics but the more I work through the calculations the more I...

Thanks for all the responses. So to make it out of a single part - casting maybe achieved with some difficultly. SLS rapid prototyping would also probably work however expensive? (I'm pretty sure you cad print / sinter copper) Options if it is split into 2 parts - Furnace brazing or diffusion...

I thought about investment casting but I thought you would struggle with the cavity. Do you know any examples of investment casting with cavities?

Hi There, I'm looking at getting this part manufactured out of copper which has internal cooling chambers. It needs to be made from 1 piece and needs to be water tight. Does anyone know of a process that can produce this? Approximate dimensions are 500mm x 60mm x 25mm Ideally I would like to...

Hi there, Thanks for the reply Ray, I have previously tried this and essentially balanced out the 2 streams till they meet however I need something a bit more accurate as its only a short Heat exchanger. The temperature change on one side I'm expecting approximately (T1 - T2) 40 - 35 degrees...

My limiting factors are area, initial temperatures and flow, I want to know how much energy can be transferred in this system, thus I'm not designing to a specific heat load. Thanks for the reply Marty. Both fluids are water and it's a plate heat exchange. For simplicity we can call it a...

Hi There, This is not a student question, it is a heat exchange that I have been designing in which I already know the physical size, material, etc of the heat exchanger but I would like to get an idea of what kind of temperature change I’m going to get by calculation rather than physical...