Fig. 1. Even though the microstructure of weld metal in E357-T6 weld repair (left) is distinctly different from that of the original cast metal, there ap- pears to be little or no effect on tensile properties. The weld repair metal shows no dendritic structure.


Presentation Effect of Weld Repair on Static and Dynamic Tensile


Properties of E357-T6 Sand Castings (13-1210)


Authors Gerald Gegel, Material and Process Consultancy, Morton, Ill.;


Daniel Hoefert, Eck Industries Inc., Manitowoc, Wis.; Joseph Hirvela, CPP, Minneapolis, Minn.; and Randy Oehrlein, Carley Foundry, Blaine, Minn.


Background


Historically, weld repair has been considered to have little to no effect on the mechanical and physical proper- ties of aluminum castings, but little evidence was avail- able to validate or refute the claim. A weld repair study was designed to consolidate industry welding best prac- tices, develop mechanical properties to demonstrate the efficacy of the practice and develop statistical data that facilitates acceptance of the weld practice.


Conclusions •


After comparing microstructures and test results, researchers found that repair welding with the process parameters used in the study has no detrimental ef- fects on tensile or fatigue properties of E357-T6 sand casting (Fig. 1).


• Properly accomplished GTA welding may be appropri- ate for joining sand cast components to each other or attachment of wrought products to cast products.


Presentation Te Next Generation Termal Distortion


Tester (13-1454)


Authors Andrew Oman, Sam Ramrattan, and Mitchell Keil, Western


Michigan Univ., Kalamazoo, Mich. May 2013 MODERN CASTING | 57


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