need help! with a downhill bend test?

admin

hi, i need some advice about a downhill bend test. What would be the best setting to run it. when doing filler passes. i took my first test and failed it. I set my machine at 18.5 volts and my wire speed at 200, for my root pass. then i went 24.0 volt and 400 on my wire speed doing fillers.i have never done a root pass with fillers all downhill then bend. any advice in what to do??
Reply:i haven't done any mig, but i did a down hill on 1/4'' plate with3/32 landing and root downhill with 1/8 6010 at 65amps, then filled with 7018 at 80amps i didnt need to just like to see if i could, it turned out flats and stringeresk. good luck with it.
Reply:I run my roots on pipe with 16v and 160wire speed, you want to aim your gun up into the puddle and if you can use a 5/32 gap so you know you tie into your walls really good.
Reply:Justin hit it dead on you have to face the arc up into the puddle. Pause and then push it up as you move down the weld. Its almost as if you are pushing the weld back up onto the puddle. The volts for the final pass seem way to high. What is the thickness is the test coupon? Always lean towards less heat on downhill welds or the puddle will get ahead of you and penetration is almost impossible. Good luck!Nick
Reply:well the plate is 5/8. thanks for the feedback.
Reply:I would stay around 22.5 volts. Once. You get in between 24-26 volts it starts to change out of short circuit transfer to globular and then spray arc. Neither of which are much use when running downhill. Let me know how you make out.Nick
Reply:failed  my test last night. again......don't understand, everything look good,but when they cut them in too 3/8 pieces you could see that they didn't penetrate into the plate.
Reply:What was the volt settings?  What type of machine are you using? Do you have a backing strip or open route?
Reply:Going downhill you have to keep your wire at the very leading edge of the puddle to avoid lack of fusion. you won't be able to carry much metal.