In OpenPlant Modeler, by default threaded joints do not have any symbol to show the connection as shown below.
If user wants to show a weld symbol for verification purpose to determine the connection the below steps should be followed.
See Also
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/25475.how-to-place-multiple-welds-in-straight-piece-of-pipe-at-equal-distance
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