welding of neotec material 1

[210269]

There is a new material my company want to use for our fuel tank which is called neotec (supplied from curos. The problem i have is the spot welding and seam welding is poor do you have any ideas of improving this.

 

[dkelly]

Neotec is a hot-dip tin-zinc alloy coated steel. If you are not familiar with welding coated steels then you are in for a bit of a learning curve. First get in touch with your steel supplier (Corus) and demand that they send some one from there welding group over to put on a little seminar on what they recommend for weld parameters. Then make sure that your weld controllers are capable of these parameters. If not then this is an excellent time to get rid of those old stone age weld controls. As compared to bare steel, the coated steels would require a pulse of current prior to the weld to melt the coating. It only requires 435oC to melt the coating. The resistance to the pulse of current by the steel would create the heat that would boil off the zinc coating. Once melted however, the zinc would puddle around the weld zone and would provide lower resistivity as compared to bare steel onto bare steel. Because of this lowered resistivity, significant higher levels of current would be required to weld coated steel as compared to bare steel. You can go through a huge big DOE to come up with the right set of parameters or if you harass the Corus rep long enough he will provide a nice chart with all the recommended settings.

Good Luck and keep smiling

 

[210269]

dKelly,
Thanks for your help