ETCHANT COMPOSITION FOR WELDING TEST CAPABLE OF REDUCING A WELDING QUALITY TEST TIME DUE TO A FAST REACTION RATE AT A WELDING UNIT

摘要

PURPOSE: An etchant composition for welding test is provided to guide a fast reaction rate at a welding unit in etching test and to obtain a clear bead form, and to achieve the reduction of test time, productivity improvement, and accurate weld quality measurement.;CONSTITUTION: An etchant composition for a macrographic test of a welding unit of a LNG ship comprises hydrochloric acid 18~22 ml, peroxide 32~48 ml, and ethanol 30~50 ml to the etchant composition 100 ml. The etchant composition is used for welding quality test of the welding unit which is selected from invar / invar, invar / sus, sus / sus, and sus / carbon steel.;COPYRIGHT KIPO 2010