surface worm imperfections

[1fasbu]

I was curious if anybody has come accross the following:
Setup:
-mm250(new)
-single ph 220v
-wire-shieldbright .035fluxcore 316L
-gas-argoshield 25c (75/25)
-ws 470ipm, 22.5v, 25cfh gas
-cup slight drag
-flat overlap fillet .250 mtl thickness
The problem we're experiencing is a surface imperfection that appears to look like a "worm". This is on the surface, when ground out there isn't any porosity adjacent to this area. This is not something we see on every weld. It will occur at random. Wind is definitly ruled out. The material is clean. We are in the field using customers machine/consumables. I do recall this same problem at our shop, but credited it to our aging equipment using .045 flux T91 with Co2 also. It seems more common with the larger wires. Is it because we are running on the outer limits of voltage/wire speed? Would a tri mix help? What about the T91? We are not dragging the cup. What is the technical explanation for this? Any help is appreciated. Thankx.

[HAWK]

ifasbu,

THE ORIGINAL POST IS "DUAL SHIELD FLUX WIRE" POSTED 9-19-2003. DO A SEARCH AND CHECK OUT THE WHOLE POST.

I had similar problems some time back running E71T-1. Here is a response from that post:
bail76
Junior Member

Registered: Sep 2003
Location: Ohio
Posts: 7
The marks in the weld are what we call "wormtracks" at work. They usually come from too short of stickout or too high of voltage. In either case the wire isn't getting enough pre heat to bake out the moisture. Also if the spool has been left uncovered in the shop their is a good chance it has picked up moisture. I usually run the .045" between 21-23 volts and 160-180 amps with a good 3/4" stickout. Best of luck.



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09-19-2003 10:05 PM

I hope this helps.