The Welding Institute (TWI) has been a vital resource among preservationists. From welding and joining to codes and standards, the Welding Institute provides general information and special topics that NPS employees in the maintenance field will find useful and helpful. This particular resource goes in depth on wrought iron and welding.
Did You Know?
If the carbon and sulphur content of iron is low, the welding capability is much easier. It also means that it was made in the furnace properly. While the components of the iron itself plays a critical role in welding, excessive penetration can damage the original fabric:
“The procedure for welding wrought iron is, in general, the same as that used for welding structural steel. However, excessive penetration into the parent plate should be avoided to reduce the risk of slag inclusions in the weld metal”. -The Welding Institute
In addition to the many challenges of welding, lead based paint can be tricky and frustrating to strip from the foundation. For safety and health precautions, it’s absolutely crucial that the lead paint be completely stripped before welding occurs.
For more information, the Welding Institute has a great reference on wrought iron and welding. You can read more about frequently asked questions like “are there any aspects of joint design to be considered in the welding of cast iron?” or “are there any fatigue design rules for bolted joints?”
You can also access:
- Published Papers – Provides a source for reference materials and industry guidance.
- Job Knowledge – Access helpful articles with information about welding processes.
- Standards Development – TWI actively participates in the development of technical and safety-related standards, to support both industry and wider society; learn more about these standards!