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Hi, Our heavy truck cab suspension air springs are failing with vertical cracks, as shown at attached photo. Horizontal cracks are result of fatigue. However supplier hasn’t found root cause and solution yet. Fatigue test is running again but failure can not be replicated at lab test. We...

Thanks for information FennLane. I will check welding suppliers. For my case, it seems like we will continue with MIG welding. I will prepare prototypes with MIG welding. It is the most economic solution. As I read at research papares, heat treatment (so hardness and microstructure) is not...

There are some papers, I requested for full text. However these are not standards. After reading article I can evaluate if it can be referenced or not.

Could you recommend any standard regarding this subject? It would help me very much. Thanks

Hi, Apart from fatigue life of base materials, I need total fatigue life welded assembly. This information cannot be found at databases. That's why I need to make tests. Results depend on base materials heat treated condition and welding parameters. It is obvious that there will be many...

Hi, Fatigue life of parts are important for me. However, I can not make fatigue tests for all variations. I need to eliminate some variations before fatigue tests by evaluating mechanical properties or microstructure. I cannot find academic research to reference. I will be happy if I can have...

I talked with Flash Butt Welding (FBW) Machine supplier. He stated that Hollow Tubes can not be welded with FBW. Also diameter of tube, bar or thickness of beam should not be more than 7mm. So, FBW is not choice for my case. I'm not sure if this information is related only for their machine or...

Some samples each are used at OEMs (not after market) can be seen at this site. http://www.kongsbergautomotive.com/products-services/off-highway/driveline/vehicle-dynamics/cabin-anti-roll-bar/ Ends are forged to the diameter is bigger for all examples. "Poor geometry and metallurgy of the...

Thanks for your answers. (CoryPad) At Cabin Sway Bars all competitors are also welding. Actually if no one was welding sway bar, I would not be the first one, however that is cheap and simple design. Beacuse of weldin process, we do not use spring steel like 55CrV4. Instead, 26MnB5, 30MnB5...

Hi, We are designing new Cabin Say Bar (Stabilizer bar or Anti-roll bar). I am searching information for material selection for good fatigue properties and also good weldability, proper heat treatment, optimum welding parameters. It seems quite big job to me. We will use hollow tube, it is...