Basic study on the optimum seam welding of membrane made from titanium sheets for waterproofing roof construction has been carried out by means of various tests such as peal tests, water pressure tests, appearance tests, microscopic observations and sectional hardness tests on the welded specimens prepared in compliance with JIS H4600 Class 1. As a result, it has been confirmed that the specimen welded under appropriate conditions, including the area close to the clips' edges, has no issue for the purpose of use and has a sufficient peal strength over 62N/mm comparing with that required from the wind resistance performance.
