7018 Welding is something every welding student should concentrate on.
Because even if you want to weld pipe for a career, you will probably be called upon to weld on pipe supports, pipe hangers, and pipe attachments that are made from Structural Steel like wide flange, or Box Tubing.
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For this video, I chose a piece of box tubing that I used in a previous video where I did a 3 pass fillet weld right in front of me on the welding table.
But structural welds like this done on the job site are done in position and not on a bench. So now its time to position the weld to simulate a field weld...
And that makes for 4f overhead, 3f vertical, and 2f horizontal 7018 welding.
C is for Current... what is the right welding polarity and amperage for application? 7018 rods are mostly intended to be run on reverse polarity..thats dcep electrode positive. and to get in the ball park on amperage for 7018 rods, just take the diameter and convert to a decimal. 1/8" = .125" and thats your amperage.
Amperage required depends on diameter of rod but also position and thickness of metal welded so 125 is just to get you started. There are times with 125 amps is too hot like vertical up on 1/4" or thinner steel.
And there are times when 125 amps is not quite hot enough like for flat or horizontal welding on thick steel.
L is for Length of arc...Happiness is a tight arc. when folks ask be about 7018 welding in overhead and vertical, my best advise is " Set the machine hot enough that the rod wont stick even with a tight arc...Then hold a tight arc"
A is for Angle... The angle of the electrode does make a difference in bead profile and penetration but fortunately, its very forgiving. for horizontal , overhead , and flat welding, Shoot for a slight drag angle. For vertical uphill welding, a dead nuts 90 degree angle or slight push angle works.
M is for manipulation of electrode...for 7018 welds, I use a tiny bit of wiggle, even for stringers. But it is not necessary. Some welding procedures limit electrode manipulation.
S is for speed of travel...Travel speed is relatively slow when welding vertical uphill. and much quicker for overhead, horizontal and flat. Watch those edges to make sure you go just slow enough to prevent undercut.