Welding with old steel
Welding with old steel
(OP)
Hi,
I come across lots of old steel where I work. The time ranging from 1928 to 2013. The very old steel which I cannot find the proof of the strength, I use 210MPa yield strength. Most of the connections are riveted but I see some welding as well. I heard the welding is not effective for 210MPa or riveted steel. If it is true, is there a specific procedure to weld that kind of steel. And how can I quantify the strength of weld at a connection.
Thank you for your time
I come across lots of old steel where I work. The time ranging from 1928 to 2013. The very old steel which I cannot find the proof of the strength, I use 210MPa yield strength. Most of the connections are riveted but I see some welding as well. I heard the welding is not effective for 210MPa or riveted steel. If it is true, is there a specific procedure to weld that kind of steel. And how can I quantify the strength of weld at a connection.
Thank you for your time





RE: Welding with old steel
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RE: Welding with old steel
If the older structural steel has been welded, you can use conventional welding (SMAW) with E7018 weld rod and weld a small tab of A 36 steel to the original steel member using a fillet weld. Once this is completed, take a chipping hammer and see if you can snap the tab off with a hammer blow. If the tab bends versus fractures at the fillet weld, you know the older structural steel is weldable. Your other option is to use PMI to determine if elements I mentioned above are present and in what quantity.
RE: Welding with old steel
I just wanted to add that, if you use PMI, you should ensure that the technology you are using can measure carbon content. Many of the X-Ray Fluorescence devices are intended for alloy steel (read: not carbon steel) and will provide less useful information.
RE: Welding with old steel
RE: Welding with old steel
RE: Welding with old steel
Mike McCann
MMC Engineering
RE: Welding with old steel