Recent content by yshgao

Hello everyone, For the BIW production cost, we know it depends on many factors, such as material cost, manpower cost, etc. Also, in the different countries and companies, the cost is different. Could we just give some numbers roughly for A, B or C class BIWs?

Hello everyone, I am looking for a book, named "handbook of the eurolaser academy, volume 2". Is anyone can provide an ecopy? Or where I can buy an e-copy?

Thanks Terry, I got misunderstanding from the product engineer. The problem and target are the same. But, the part is the rotor, not the vane. If it is for the vane, 1070 could be understandable at least due to its spring characteristic. But for the rotor, it really does not make the sense to...

Thanks for your help, Terry, Just came back from a business trip and still want to keep this topic alive. this part suffers from both of bending pressure of up to 80 bar and a severe wearing even under the oil lubricated condition. So, we concern its strength and the wear resistance...

Thanks Terry, The application needs strength and also wearing resistance. The current metal is 100Cr6, which is 52100 in North America. The custom asked whether we can use C70S6, which is AISI 1070 in North America, to replace 52100. 52100 has more carbon (1.0 %), and higher Chromium (1.45%)...

FYI only. This is a low carbon cast iron/steel. normally, the surface is carburized for higher hardness and wearing resistance. Then quenched and tempered. It does not make a sense to do the inductive hardening w/o carburizing.

I need to verify these two metals based on the strength and wearing resistance. Both of them are high carbon steels even the carbon contents are a little difference. The HT of them could be the same, i.e. through hardening, quenched and tempered. please can someone help me to get the following...

Thanks DABwilldo and everyone, I will keep your idea in mind. I will check with my designer whether we can change the design. But, at least we knew, these two parts are weldable if we do not care about the cracking. If the force or load is not the big concern, this welding operation may work.

Hi IRstuff, There is no much worry about the hardness in the welding area. My question is whether we can weld them as easy as the normal welding process. Is any influence of the hardened surface on the weldability? Hope I can make my question understandable.

Hi Metengr, Thanks for your time. The welding must be the last operation. The cracks may not be the big concern due to the small force on this part. My concern is the weldability between two AISI 4140 pre-hardened parts.

Hi, again, After talking with my design engineer, these two parts have to be surface hardened before the welding due to the assembly request. Please advise whether we can weld them? Also, I think the projection welding should be the only way we have to go.

Hi there, I have one induction hardened part (I call it as part 1). Its material is 4140. Now, I have to weld another part (Part 2) on part 1. The thickness of part 2 is 1.0 mm. If I pick 4140 as the material of part 2 and go for the case hardening. Can we weld two hardened parts together? Or...

Hi there, If we want to harden 8620 with carburizing, Please advise if the following forming, heat treatment and hardening process correct: 1) forming to near net shape (cold or hot) 2) stress relief or normalizing to release the residual stress 3) machining to the expected dimension and...

Hi All, if we design the motion device no matter gear to gear, or ball to plate, the surface hardness on one part should be harder than another one. Please tell why?

Thanks, TVP, In the 2nd question, the part likes a cup, rather than the gear. A small roller contacts it with the contact stress of 1300 MPa. The roller surface will be very hard. Due to its life-time running in the vehicles, I think 4140 or 4340 may have better performance due to their alloy...