Powered by mwForum 2.
Not logged in American Welding Society Forum. By elmo Date Hi All im a semi begginer welder. By electrode Date Sir, though agreeing with Hence, may I ask on the exact meaning of " electrical problem " and some further details maybe on your welding boundary conditions?
HI well i was wondering in terms of causing the ground of the outlet which the welders are connected to, to jump. By petty Date Most common mistake is if one of the welders forgets to connect the ground clamp to the part.
That machine will likely start to weld, but is grounding through the power cord, and then either trips the breaker or starts the power cord on fire. Or worse If all of the Single weld hook up are properly grounded, no problem. Sir, first of all, thank you for the prompt response. I was just curious on which welding process es and surroundings you are involving in to your considerations. Asking for some " However, from what I seemed to learn from your reply you are rather speaking of Shielded Metal Arc Welding.
Thus the comments from the other fellows, particularly 'petty ', are valuable due to being comprehensive and intuitive. By Date There are many situations where more than one welder may be working on the same structure or single member.
Consider for a moment a building, a bridge, a ship, or large pressure vessel. There may be 10's of welders working "Single weld hook up" the same structure.
As already noted, the welders must be sure the member or structure is properly connected to the power supply via the workpiece connector and the workpiece lead.
One problem that comes up now and again is the problem of magnetic arc blow. This can be exacerbated when several welding machines
Single weld hook up connected to a common point or location.
The intensity of the magnetic field is a function of the welding current passing through it, so if there are welding machines connected to a common point, the strength of the magnetic field can be sufficient to cause the member to become magnetized. There have been several projects where I was hired to demagnetize the members so welding could precede, but to prevent the problem from reoccurring, it was necessary to connect the welding machines to several different locations to disperse the welding current.
The welding process is used is not generally a concern. The current is the primary issue.
The strength of the magnetic field is directly proportional to the welding current. The intensity is a function of current density.
If it is possible to connect the welding machines to opposite ends, and it is possible to place the welders on the ends opposite the work piece connection, the effects of magnetic arc blow can be greatly mitigates because the welding currents "buck" each other and cancel the effects.
Best regards - Al. By RonG Date You may just as well could have ask about 2 or more Welders WALKING on the same piece of steel at the same time, same potential may or may not be depending on many real obvious reasons. How you doing Al?
I was just speculating that most of if any the problems you might encounter would be applicable to any thing else you might be doing to single piece of material such as standing or walking on it. The rest is like every other problem we work through every day. Considering most Welder have good working knowledge doubt there is much danger in the Electrical aspect.
That leaves the need for room to perform your work with out interference form the other Welder. I have encountered a where a fellow with a big Lincoln would steal my heat sometime "Single weld hook up" strike up an Arc and make my cry and moan but then we moved grounds around until it stopped doing it but we worked through it. By aevald Date Hello Al, I appreciate your response and can identify with your explanation of the "magnetic arc-blow issues".
In our shop at the school, the framework that makes up the arc welding booths 24 Single weld hook up them is a point of common grounding. We used to have the main grounds from our 8-Paks and other power sources attached directly to this framework. As we experienced different levels of arc blow we considered options for possibly minimizing this effect.
Our next step was to break out the grounding connections from all of the power sources and install individual grounds from each individual point power source. This actually helped with minizing some of this effect, yet when you still have a common framework I don't believe it totally negates the possibly of the phenomenon magnetic arc blow.
Currently we still experience random issues of arc blow. I believe it comes from the common framework issue as well as the issues of how many folks are welding, which booths they are welding in, what processes and levels of current and voltage are being used and likely the alignment of the moon and the stars! I simply try to explain to students the basic theory with the issue and then also explain to them that there are so many variables involved that there is not necessarily an exact response that will address it every time.
Experimentation and notation of results can sometimes reduce or take care of it if you are willing to explore options implement them. Thanks and best regards, Allan. Hello Allen; Please take a look at the attached sketch. The workpiece connection "Single weld hook up" be at the opposite end from where the welder is located, not to a spot close to the welder.
The currents have to cross each other in order to "buck" each other. I have used this technique to correct problems with magnetic arc blow on several projects. In each case I had anywhere from two welders to six welders welding on the same girder.
It works best when the welders are using nearly the same current to balance them. In your situation, I would not have the workpiece connector in the same cubical as the welder, but rather, I would
Single weld hook up it at the far end of the framing.
Another step that I take when I have welders welding their test plates is always have more than one tack weld securing it to something solid. When the test plates are in the vertical position I have Single weld hook up welder tack the plates to the bench at the two opposite corners at the bottom of the plates and I run two bars from the top corners diagonally down to the bench.
It serves two purposes; first, it provides multiple current paths reducing the current density at any one connection point, second, it provides a more stable set up.
The plates don't bounce as much when the welder is knocking off the slag and dingleberries. Handsome fellas, don't you think?
Sorry Sourdough and Cactus. Hi Al, appreciate the sketch and when I am done chuckling, laughing, and generally can recompose myself, plus have more time to reply, I'll get back to you on this one. Thanks and regards, Allan. By WeldorJoe Date How's the world treating you? Are you going to FabTech? I need to make arrangements as soon as I find out when my committees are getting together. I'm looking to collect Single weld hook up that offer for a cup of hot tea someone offered.
Oh yea, it was Brent. See you at the show Brent. By welderbrent Date Certainly hope so Al. Had a great time meeting 'new' people last year and looking forward to meeting more this year as well as renewing some I met before. They need to set up an area where members of this forum can check in and see who else is there.
Might make it easier to 'bump' into each other, especially for that cup of tea. By Paladin Date Al, That is interesting and I can see the logic in it. We usually hear "keep the ground close to where you are working".
I guess it just Single weld hook up. I am impressed with your art work. Next time I experience arc blow I'm sure it will bring a smile.
Sir, comments, answers and new questions have come in meanwhile. Assessing yourself initially a " semi beginner welder " may I ask whether these proved helpful to you? There was an interesting fraction in one post that particularly intrigued me: By Lawrence Date I'll make one plain talk safety statement that I haven't noticed in this thread. If this is a duplicate I apologize. When several welders or operaters are working on the same structure, they should avoid touching two electrode holders.
If this cannot be done, all DC machines should be connected with the same polarity and all AC machines should be set at the same phase of the supply circuit with Single weld hook up same polarity.
If two machines are "out of phase" with each other, the voltage between the electrodes is doubled! In such cases no load voltages between electrode holders will be 2 times normal in d. Similar voltage differences will exist if both a. Of course also from 'max'. Hope we live up to any expectations for being able to lend informational value to your questions.