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.
Photo by Kevin Lamarque/Reuters. President Obama took the unusual step of holding a formal event in the White House Rose Garden on Tuesday to announce three nominees to the U.S. Court of Appeals for the D.C. Circuit. Roses are by far the most culturally significant flower in the West.