- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
gasless mig welders are used the same as gas /wire migs
the only difference is the polarity of the leads to the hand piece and the work ground and this is indicated by the plug in the machine for the ground lead
what the "someone " would have been referring to is the duty cycle of the unit
every welder has a duty cycle because of the heat generated in the welding process by the electronic components and transformers and if that duty cycle is exceeded the machine stops working until it cools down or damages the circuits
it is stated as a % of time in use so a unit with a 20% duty cycle means that for every 20% of use it has to cool for 80% of time
as an example ---if you were using a stick welder, the time taken to burn the stick would be 20% and the time taken to insert a new stick and clean the slag off the weld to resume the process would be the 80%
It also depends on the amps being used for the weld
on a machine with 120amps capacity and you were using 15 amps to weld sheet metal--body panels - the length of welding time will be considerable compared to using 115 amps where the weld time would be a few minutes
there are plenty of helpful hints in the operators manual and other technical publications on line
read you hand book on the settings but it all depends on material thickness being welded
higher volts = higher amps will require faster feed speeds = thicker materials
sheet metal thickness (.040"-1mm) will require very low volts -up to 20 v with a slower feed speed
remember the unit will have a very short duty cycle and that means that you cannot start a weld and keep it going for many minutes especially at high amps
it works like this ,if it is a 20% duty cycle ( on the plate of the machine then for every 20 seconds of power ( high amps) the machine has to rest for 80 seconds
if you are welding panel metal the ( very low amps) then you can weld for longer periods but the rest period has to be 4 times the weld period
They told me at welding school the mig transformer has a different slope (whatever that means?) to the tig and mma transformer so I am a little surprised at your question. The implication is two transformer are needed for the three types of welding and for tig and mig a dc converter and also for dc mma welding.
From your description it seems as though welding current is not arriving at the tip of the mig torch or the current is arriving in the wrong form.
You say the mma is fine but you didn't say whether it is fine on ac welding, dc welding or both. I have not tried mig welding with ac and have no idea whether it would be successful but I imagine a lot of sparks and not much welding. The problem could be the rectifier unit is either not working or is switched out of the circuit.
Polarity is important too with dc tig and mig welding.
you can weld aluminum with the lincoln but you will need to change the liner in the wand to a nylon one and swich the gas to 100% argon and of course change the wire to an aluminum roll. and practice-practice-practice it is much more difficult to weld aluminum then steel and requires much more control.
No a miller 140 does not need to be calibrated all that must be done is to set the drive roll pressure so that the rolls will slip if the wire binds up a little bit and adjust the wire speed and voltage so that the sound that is made during welding is the sound of bakon frying in a frying pan. Hope This Helps Don
a mig welding unit of 100 amps is very low, you will require a small wire size, plus the contact tip, liner to suit, expect to get a maximum amperage of 70- 80 amps max, if the unit is Aluminium wound transformer then expect 6 months use, and the ampage will drop ,then its scrap, depending on the weather conditions that the unit is kept, will depend on the live of the unit.
15 PSI is the absolute MINIMUM flow rate you should use on ANY project.
35 should be the max required without physical shielding. If he is good at what he does, he may feel the need to stick with what he knows for good shielding/penetration/ and quality. You are the boss, and he should be supbordinate to your requests. If all else fails, comprimise on 25, and lock-tite the adjustment knob!
Also, your welding supplier may have a handy dandy reference chart for regulator settings based on material and wire you are using. http://www.millerwelds.com/resources/improving-your-skills/mig/
Research a little here for guides and reference materials.
MIG stands for Metal Inert Gas welding, many times called Wire-feed.. Also referred as GMAW (Gas Metal Arc Welding). The "Metal" refers to the wire which is what is used to start the arc. It is shielded by inert gas and the feeding wire also acts as the filler rod. A semi-automatic process, it is fairly easy to learn and use.