Found it! In default Notrium I found this in the metal tubes effects block
     none;//event failure text     use.wav;//sound, none for nothing     0;//vanishes after event, 0=no, 1=yes     U;//use key     -1;//quick key     begin_conditions;       0;//condition       82.000000;//condition parameter0       1.000000;//condition parameter1       0;//condition       202.000000;//condition parameter0       1.000000;//condition parameter1     end_conditions;     begin_effects;       16;//effect number       202.000000;//parameter1       -1.000000;//parameter2       0.000000;//parameter3       0.000000;//parameter4       16;//effect number       201.000000;//parameter1       -1.000000;//parameter2       0.000000;//parameter3       0.000000;//parameter4       16;//effect number       203.000000;//parameter1       1.000000;//parameter2       0.000000;//parameter3       0.000000;//parameter4  So, using the metal tube is how you combine them, not actually trying to combine them  . Edit: Also, you need a welding torch.
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