Arc Welding Articles

The arc welding technology area focuses on the most commonly used arc welding processes, mainly GMAW/MIG, GTAW/TIG, SMAW/stick, and plasma. The articles and press releases cover processes and power sources, plus all of the related items—electrodes and wire, wire feeders, fixtures, manipulators, positioners, and power sources. If you need information on personal protective gear, ventilation systems, and safety practices for welders, see our Safety coverage area.

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Arc Welding 101: Satisfying the weld inspector

October 7, 2014

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Q: We have a stiffener bar (continuity connection) in a column that calls for AWS D1.1 BTC-P4 for the flanges and fillet welds on both sides in the web. The stiffeners were field-welded. After assembling 35 connections, we discovered no fillet weld on the bottom side in the web. We can’t weld the...

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Arc Welding 101: What's up with a WPS?

October 6, 2014

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Q: Do I need a welding procedure specification (WPS) for my company when it is just me and all I do is on-site portable welding of a wide range of items?Steven B. A: Whether your company requires a WPS depends on the customers you serve. For example, if your company is hired to fabricate your...

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Arc Welding 101: Vertical-up or -down in robotic welding?

October 3, 2014

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Q: We have a weldment that incorporates 0.375-in.-diameter steel rods and a 0.060-in.-thick sheet metal stamping of 1018 CR material. Each weld is the same, 0.75 in. long with a 0.25-in. fillet, perhaps including weaving. The assembly is fixture and welded robotically using GMAW with CO2 gas and...

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Arc Welding 101: Clearing up ASME B31.3

October 2, 2014

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Q: I am unclear about a section relative to the ASME B31.3 code for chemical plant piping.The area of this code referring to the type of welding process that is acceptable—328.2.2—states welding procedures qualified by others may be used, provided that the following conditions are met: The...

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Arc Welding 101: Tackling trim in pulsed MIG welding

October 1, 2014

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Q: We use the pulsed-spray-transfer GMAW process in our shop. When setting weld voltage, we can adjust the trim between 0.5 and 1.5. What do those numbers mean, and how do they relate to weld voltage?Corey G. A: Pulsed-spray-transfer welding equipment has challenged the conventional wisdom we’ve...

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Arc Welding 101: Which welds need visual inspection?

September 30, 2014

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Q: We work on off-road and lifting equipment, and our welders are qualified per AWS D1.1. Which welds are required to be inspected visually and by whom?Ed Z. A: When you asked which welds are required to be inspected visually, I had to snicker. There was a time in my life when one side of my hard...

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Arc Welding 101: Addressing linear porosity

September 29, 2014

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Q: We are experiencing linear porosity at the furthest point of penetration when welding heavy plate. The porosity is 0.3 mm dia., but it occurs regularly in every weld we’ve sectioned so far.We are using a semiautomatic spray transfer process with a 0.045-in. ER70S-6 electrode, and a shielding...

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Arc Welding 101: Three keys to a successful CWI

September 26, 2014

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Q: I was recently interviewed by a writer who was researching how welders make the transition to certified welding inspectors (CWI). One of the questions he asked was, “What key skills make for the best certified welding inspector?” A: Communication—written, photographed, or verbal—is the...

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Arc Welding 101: Globular-transfer mode for MIG

September 23, 2014

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Q: I am employed as an AWS D.1.1-qualified welder at a machine shop. I was wondering why you can certify on 75 percent argon/25 percent CO2 when you are not allowed to use a short-circuit transfer on materials over 3/16 in. You need at least 83 percent argon to obtain a spray transfer, yet I passed...

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Arc Welding 101: Achieving a good work lead connection

August 29, 2014

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Q: What makes a good ground connection, and why is it important? A: In a welding circuit, current needs to pass through as few connections as possible, and the circuit itself needs to be as short as is practical. On the positive (+) side for gas metal arc welding (GMAW), direct-current electrode...

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Fabricator delivers a big fish story

August 28, 2014

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Lou Rodriquez finds out he has a talent for creating metal art and ends up with a fish tale that is easy to believe because people can see the result: a huge metal sturgeon that’s the talk of Port Huron, Mich.

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Arc Welding 101: Reading between the lines of AWS D1.1

August 27, 2014

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Q: I am a weld inspector and one of my clients builds control panels. A potential customer of theirs requested that they conform to AWS D1.1 standards on a control panel. This seems odd to me. Can a company become AWS D1.1-certified? Is there a certain process they have to go through to become a...

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TIG welding: When looks matter

August 18, 2014

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Every GTAW bead tells a story. Learn how to identify what your weld bead says and make adjustments to amperage, travel speed, and consumables to ensure your GTAW bead tells the story you want it to.

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Success breeds success as hardbanding service provider evolves into equipment vendor

July 21, 2014

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When Dave Milo set out to build a portable hardbanding unit, the former trucking company owner knew little about welding and nothing about hardbanding. After updating the hardbanding unit design a few times with consulting help from Lincoln Electric, Milo thinks he’s ready to change direction. Rather than providing hardbanding services, his goal is to sell hardbanding machines.

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Hope dies last

July 9, 2014

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A hard-nosed welding instructor at a medium-security prison in rural North Carolina gives his students discipline, confidence, a foot in the door to a trade, and the possibility for a new life upon release.

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