5.5.2 Molds shall be protected from moisture contamination and freezing during storage. Charges shall be protected from moisture contamination during storage.
5.5.3 Charges and molds shall be protected from moisture contamination during transportation from storage to work site.
5.5.4 Molds and charges shall be used within the shelf-life period recommended by the manufacturer
5.5.5 Crucibles (reaction chambers) shall be clean and dry at all times.
5.5.6 Crucible, mold, charge, and adjacent rail area shall be protected from moisture.
5.5.7 Rail weld geometry shall be checked with a straight edge and taper gauge in accordance with the requirements of AREMA 4-2.5, Specification for Quality Assurance of Thermite Welding of Rail, or those selected by the operating authority.
5.5.8 Alignment and Finish Requirements
5.5.8.1 Alignment tolerance of running surfaces should be within the requirement of the individual railroad.
5.5.8.2 Additional grinding to remove surface defects should be kept to a minimum.
5.5.8.3 If required, a light grinding of the weld collar area to remove sharp corners or surface blemishes is permissible. Care should be exercised to prevent aggressive grinding. All grinding of the weld collar should be symmetrical, the as cast geometry should be left intact.
5.5.8.4 Radiography is not recommended for inspection of thermite welds. Defects are very difficult to detect and interpret.
5.5.8.5 Visual and ultrasonic examinations of finished welds are recommended.