Evaluation and Repair of Wrought Iron and - Purdue e-Pubs ...

41visible damage and non-repaired tensile testing coupons were also machined from thiseyebar. Welded tensile testing coupons were machined from Eyebar 5 which also hadnot experienced much visible damage.Eyebars 1 and 2 were partially heat straightened to help the machinist prepare thetesting samples. To heat straighten the eyebars, a blacksmith heated the damaged andbent areas until they were bright red hot in color. Once the material was heated to thiscolor, the pieces were then hammered until they were straightened. The heatstraightening created a blue area that was easily noticeable on the wrought iron eyebarsafter cooling to room temperature. Figure 3.7 is a photograph demonstrating the colorvariation in the wrought iron eyebar after heat straightening.To more accurately determine the temperature of the wrought iron during heatstraightening, a sample from Eyebar 3 was heated until it was the same cherry red colorused when areas on Eyebars 1 and 2 were heat straightened. A pyrometer was then usedto record the temperature at various locations on the red hot piece of wrought iron. Thetemperatures ranged from 1160 to 1270 degrees F. Figure 3.8 illustrates the test piecewhen it was the cherry red color immediately before the temperature was taken.All of the heat straightened areas were measured and recorded. Then anappropriate labeling scheme that noted which specimens had been heat treated wasdeveloped. This labeling scheme was marked on the eyebars in sections where thecorresponding specimens were to be removed and machined. The sections of the eyebarswere carefully measured and then cut for tension coupon testing specimens.Eyebar 1 and 2 contained sections of both heated and non-heated areas. Thesetwo eyebars were split into appropriate sections and then machined into standard tensiontesting coupons. To meet ASTM A370 standards, the eyebar sections were surfaceground and then milled to the adequate dimensions. It was essential to ensure that the