A/C EVAP tube leak

I have developed a leak on the EVAP tube where the orifice sits. It has a small crack where the tube integrates into the mounting flange center over the orifice housing. Is there something I can use to repair it (ie JB Weld) that will not fail, or do I have to replace it? This one I got from pic-a-parts and lasted several years, but I would like to avoid having to take off another one from the salvage yard. It's anywhere from 105-112 degrees outside and 90's in the mornings, so I'm hoping you can suggest something that will work to repair it. And I know to replace the accumulator and orifice and apply vacuum to check for leaks and to cleanse the system before charging. That reminds me, I've watched videos and read articles in reference to adding oil, dye or a mix of both into the charge hose. I'm using straight R134A refrigerant. Doesn't R134A come with lubricant in it from the manufacturer? I know that one down side is not knowing how much oil is being added unless using a measuring cup, even with that, there's no way to tell how much the compressor needs without pulling it out of the vehicle and drain it into a measuring cup, otherwise it's a guessing game. Too much or too little, and then it could get over or undercharged. So many contradictive opinions. Please explain the pros and cons and proper way. By the way gauge readings on initial test: lo-side=0, hi-side=50. System looks all but empty. Thanks Wrencherhead