Soreness does not need to happen to get a good weight lifting workout. During the workout you should work your muscles to exhaustion. IE, you just did 12 reps in prefect from but if you did the 13th you couldn't hold prefect from. That's exhaustion or failure. I like the word exhaustion better as people tend to take to it a bit better then if I tell them to work to failure.
But all you need to do to get a good workout is do as many as you can in *PREFECT* form. Once you turn the wrist, or push the elbow out a 1/16th of an inch it may allow you to do one more rep, but it's not doing you any good, put that weight down rest, and either try another set after a good rest or move onto another muscle to torment, as the minute your out of prefect from, your body has declaired itself done, and your just wasting your time and may hurt yourself if you keep going. I know we all love to wake up in the moring and feel our bodies ache from the hard workout we did yesterday, but it really isn't needed. As long as you push yourself and go for exhaustion, your doing what you should be doing and getting as good of a workout you can get.
If you work to exhaustion each time you will notice yourself getting stronger slowly and you can then add more weight and you'll probably have that soreness again for a few workouts.
Kit