Structural ironworker holds acetylene torch fthat he will use to enlarge bolt hole so upper column section can be bolted to splice plate. Torch is fed acetylene and oxygen through hoses from acetylene and oxygen compressed gas tanks. This photo shows the hoses and the valves that feed the torch. Ashley Terrace, Ann Arbor, Michigan April, 2007.
Constructioncranestructuralsteelerectironworkercolumnwide flangebuildingspliceplatebull pinAshley TerraceAnn ArborMichiganApril2007structuresteel erection 9304
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