I took a couple of additional references and ended up not using them ( Welding Symbols Charts, Specifications for Structural Joints using High Strength Bolts, etc.) From what I can remember, the "Steel Manual" questions are pretty basic code look up type questions, you just need to know where to look and have the resource (i.e. the actual "Steel Manual").
If there is a welding question, it would probably be a detail of desired weld and you need to you match the corresponding welding symbol (or vica versa). I believe the NCEES Construction Depth Sample Exam has this type of question on it.
Note: There should only be one or two total "steel manual questions" on the exam.