Penetration color of weld in steel

Porosity is the result of gas entrapment in the solidifying metal. These interruptions may occur in the base metal, weld material or "heat affected" zones. Holding too long of an arc increases overall heat input, increases the potential for distortion, widens the weld bead while decreasing penetration and affects weld bead appearance. At 60 amps, things go wrong due to my inexperience. The best way to prevent sugaring is to ensure you have adequate gas coverage on the front and back of the weld and to be sure that you do not overheat the weld.
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Challenges of Welding Aluminum

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Tig Welding Titanium

On some wire feeders, the wire spool position is adjustable -- align it so that it makes a straight path into the tube. Modern welding equipment can help minimize the chance for burnout. Internal or root undercut is an erosion of the base metal next to the root of the weld. I have been trying to TIG weld steel pipe, but on some occasions there appears to be bubbles in the weld. This electrode provides a smooth, stable arc and has excellent restart capabilities. Start at and work upward.
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TIG - Amps & penetration, widening gap issue, gray colored welds

Keyhole — A technique of welding in which a concentrated heat source penetrates completely through a work-piece forming a hole at the leading edge of the molten weld metal. It is only practice that will make you better. Penncrest Buzzbox - Infinite amp control! Burr — A rough ridge, edge, protuberance, or area left on metal after cutting, drilling, punching, or stamping. Back then, if it wasn't in the Sears catalog, or the Northern Hydraulics catalog, i didnt know about it and couldn't buy it. As the heat source progresses, the molten metal fills in behind the hole to form the weld bead.
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Internal concavity or suck back is a condition where the weld metal has contracted as it cools and has been drawn up into the root of the weld. Prior to this time, pharmaceutical pip-ing systems had traditionally been installed using the 3A Sanitary Standards as guidelines for fabrication. If improper welding procedures are used, tungsten may be entrapped in the weld. Porosity can take many shapes on a radiograph but often appears as dark round or irregular spots or specks appearing singularly, in clusters, or in rows. Misalignment can result from operator error in loading the weld head or from worn-out tube clamp inserts, or collets, that hold the components in the weld head. Post-Heating — The application of heat to an assembly after welding, brazing, soldering, thermal spraying, or cutting operation.
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