The 7 Most Common Welder Issues and How to Troubleshoot Them

Whether you are working in a climate-controlled shop or out in the humid North Texas heat, welding is a craft that demands precision. But let’s be honest: some days, the machine just does not want to cooperate. You are getting holes in your bead, the wire is birds-nesting, or the arc sounds like a bag of popcorn in a microwave.

Before you get frustrated and throw your hood across the shop, take a breath. Most of the issues we see at Tarrant Welding and Industrial Supplies come down to a few common culprits. Here is a guide to the seven most common problems you will face and how to fix them so you can get back to work.

1. Porosity (The “Swiss Cheese” Look)

Porosity is probably the most common headache for any welder. It is when you see tiny holes or bubbles in the surface of your weld. It looks like a sponge, and it is just about as strong as one, too. Usually, this happens because your shielding gas is not doing its job.

If you are working outside in the DFW area, even a light breeze can blow your gas away before it protects the puddle. The fix? Use a wind screen or switch to Stick or flux-core. If you are inside, check your gas flow. Too little gas is bad, but too much gas can actually cause turbulence that sucks air into the weld. Also, make sure your metal is clean. Oil, rust, and moisture are the enemies of a solid bead.

2. Excessive Spatter

Spatter is those little balls of molten metal that fly out and stick to your workpiece. It makes a mess and adds a lot of grinding time to your day. Most of the time, this is caused by your settings.

If your wire speed is too high or your voltage is too low, the arc will struggle, causing that “pop” and splatter. It can also happen if your polarity is backward. Check your machine’s chart and make sure you are set up correctly for the wire you are using. A little bit of anti-spatter spray can help, but getting your settings dialed in is the real cure.

3. Wire Feeding Issues

There is nothing quite as annoying as a MIG gun that won’t feed. You pull the trigger and nothing happens, or worse, the wire tangles up inside the drive rolls (we call that a birds-nest).

This usually happens because of tension. If the drive rolls are too tight, they crush the wire. If they are too loose, they slip. Another big culprit is a dirty or worn-out liner. If you haven’t changed your liner in a while, dirt and shavings can build up inside and create friction. Treat your liner like the oil in your truck: change it before it causes a breakdown.

4. Undercutting

Undercutting is when the weld burns a groove into the base metal but does not fill it back up with filler. This leaves a weak spot at the toe of the weld that can crack under pressure.

Usually, this is a “human error” issue. You might be moving too fast or holding your torch at the wrong angle. It can also happen if your heat is way too high for the thickness of the metal. Slow down, watch your puddle, and make sure you are “weaving” or pausing long enough at the edges to let the filler metal bridge the gap.

5. Arc Instability (The “Bad Ground” Culprit)

If your arc is flickering, wandering, or won’t stay lit, the first thing you should check is your ground clamp. Out here in Texas, we deal with a lot of dust and humidity, which can lead to corrosion on your work surfaces.

A weak ground is like trying to run a marathon with one shoe. If your clamp is attached to a painted or rusty surface, the electricity cannot flow properly. Clean a spot down to shiny metal and attach your clamp directly to the workpiece whenever possible. You would be surprised how many “broken” machines are fixed just by cleaning the ground.

6. Slag Inclusions

This one is mostly for the Stick and flux-core guys. Slag inclusions happen when the slag from the previous pass gets trapped inside the next layer of the weld. It creates a pocket of weakness that can lead to failure.

The solution is simple: get a chipping hammer and a wire brush and use them. You have to clean every bit of slag off the bead before you start the next pass. If you are welding in a deep groove, be extra careful about the angle of your rod so you don’t “trap” the slag against the side walls.

7. Overheating and Duty Cycle

We have all been there: you are on a roll, the beads look great, and suddenly the machine just stops. The light is on, but nobody is home. This usually means you have hit your machine’s duty cycle.

Every welder has a limit on how long it can run at a certain amperage before it needs to cool down. If you have a small machine and you are trying to weld 1/2 inch plate all day, you are going to hit that wall fast. Don’t turn the machine off when it overheats; leave the fan running so it can pull the heat away from the internal components. If this is happening to you every day, it might be time to talk to us about an upgrade.

Expert Help in Fort Worth

Troubleshooting is part of the job, but you do not have to do it alone. At Tarrant Welding and Industrial Supplies, we believe that every job should be handcrafted, local, and done right. That means having the right knowledge and the right gear from the start.

If you are battling an issue that you just cannot solve, come see us on Bryan Avenue. We do not just sell equipment; we are here to support the DFW welding community. We carry the best parts, liners, tips, and safety gear to keep you in the booth and out of trouble.

Upgrade Your Setup Today

If your current machine is giving you more grief than it is worth, it might be time to look at something more reliable. We offer easy financing options on new Miller, Lincoln, and ESAB rigs. You can get a modern, dependable machine that handles these common issues much better, and you can pay for it over time while you work.

Stop by the shop or give us a call at 817-927-3331. We will help you troubleshoot your current setup or find a new one that fits your workload perfectly. Let’s get your shop back to running at full speed.