For laser welds in thick section steel, the main cause of solidification cracking is the weld profile shape. The high depth to width ratio of laser welds causes restraint and means that high thermal stress acts across the weld where the solidification fronts meet, causing centreline cracking.
Two days later they will participate in a Rose Ceremony as the final step in their graduation process. While a rose is symbolic for many things, the School of Nursingâs Jasmine Clark says it has become a traditional event at UBC and a time-honoured tradition.
Making the world better, one answer at a time. Traditionally, the moving of the tassel at graduation is called, turning the tassel or the turning of the tassel ceremony.. It symbolizes one's transition from candidate to graduate.