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Hello everyone. I would like to ask you for some information about difference between Spotflag 1 and 5 (0) in Interface type 2 (tied). I am running explicit model of front seat with lot of seam welds areas, for crash analysis. If i use spotflag 1 (optimized for spotwelds and rivets), mass scaling raises about 5% comparing to default formulation 0 (5). As far as i know spotflag 1 is recommended for spotwelds and for BRICK elements in master surface, what is not exactly my case. My connection is shell elements (master) and spring2N (slaves). So can you tell me, what are the differences between these spotlags, and which one should I use? I will also appreciate some kind of mathematical / physical interpretation if it is possible. Thank you very much in advance. Daniel