Equipment & Materials

Welcome

Hello, and welcome. This is Super Structures General Contractors — a national general contractor headquartered in Powhatan, Virginia — here to help you and your clients build something that lasts. We're glad you're with us, and we look forward to connecting with you.

Alright, Equipment & Materials. Don't let the plain title fool you. Cut through everything, and it's this: Good welds start before the arc — with the right machine, the right consumables, clean and properly prepared joints, and gear that protects the welder. Get comfortable here and most weld problems disappear.

The machine

The power source supplies the welding current. Constant-current (CC) machines run stick and TIG; constant-voltage (CV) machines run MIG and flux-core; many modern multi-process inverters do both and are light enough to carry. Field crews use engine-driven welder/generators on trucks and trailers. Key specs: output amperage, duty cycle (how long it can run at a given output before it needs to cool), and input power.

Consumables

• Stick electrodes — classified by AWS number (E6010, E6011, E7018). The 7018 low-hydrogen rod is the structural workhorse and must be kept dry in a rod oven.
• Solid wire for MIG (ER70S-6 is the common mild-steel wire) and flux-cored wire (E71T-1 gas-shielded, E71T-11 self-shielded, and others).
• TIG filler rods and tungsten electrodes (thoriated, lanthanated, ceriated).
• Shielding gases — 75/25 argon/CO2 for MIG on steel, pure CO2 for deeper penetration, pure argon for TIG and aluminum, tri-mixes for stainless.

Tools around the weld

Angle grinder with grinding and flap discs and wire wheels; chipping hammer and wire brush for slag; clamps, magnets, and fixtures for fit-up; squares, tape, soapstone and scribes for layout; oxy-fuel or plasma cutter and a beveling tool for joint prep; temperature sticks or an infrared thermometer for preheat; a weld gauge to check size and profile.

Protective gear

An auto-darkening helmet with the right shade for the amperage; safety glasses under the helmet; a flame-resistant jacket or leathers; welding gloves matched to the process (heavy for stick, thin for TIG); leather boots; a welding cap; hearing protection when grinding; and respiratory protection when ventilation isn't enough.

Materials and joint prep

Carbon steel welds easily. Stainless needs the matching filler and heat control to avoid losing corrosion resistance. Aluminum needs AC TIG or spool-gun MIG, scrupulous cleaning, and respect for its oxide layer. Whatever the metal: clean (no rust, mill scale, paint, oil, or moisture), fit (root opening and bevel per the drawing or WPS), and tack before welding out.

Going Deeper (Intermediate)

Joint preparation is the step most beginners rush. A groove weld's bevel angle, root face, and root opening are specified for a reason — they control penetration and fusion. A fillet weld on a gap wider than specified needs a bigger weld or a repair. Fit-up with clamps and tacks that hold the joint through the heat, and a welding sequence that balances distortion, separate a straight assembly from a warped one.

Rod and wire storage matters: low-hydrogen electrodes exposed to air pick up moisture and must be rebaked or discarded per the manufacturer; flux-cored wire left on a machine outdoors overnight can be ruined.

Advanced / Pro-Level

Pros size equipment to the work: duty cycle for production welding, amperage for thick plate, and engine-driven units with enough auxiliary power for grinders and lights. They standardize consumables so every welder on the crew runs the same wire and gas, which makes WPS compliance and inventory simple. They track consumable lot numbers on code work where certifications of conformance are required. And they treat the welding lead, ground clamp, and connections as part of the circuit — a poor ground causes half the "machine problems" on a jobsite.

Practice Challenge

Welds on a structural job keep showing porosity in the first inch of each bead. The welder blames the machine. What would you check first? (Answer: contamination and shielding before the machine — mill scale, paint, or moisture on the joint; for MIG or gas-shielded flux-core, gas flow, wind, and a damaged liner or nozzle; for stick, damp 7018 electrodes that weren't kept in the oven. Clean the joint, confirm the consumables, then look at settings.)

In Practice

A crew with dry rods in an oven, clean bevels, and a weld gauge in the pocket passes inspection the first time. A crew that welds over mill scale with rods from an open can repairs the same joint twice.

Common Mistakes to Avoid

• Welding over rust, paint, or mill scale
• Low-hydrogen electrodes left out of the oven
• A machine or duty cycle too small for the work
• The wrong helmet shade or gloves for the process

Takeaway: Good welds start before the arc — with the right machine, the right consumables, clean and properly prepared joints, and gear that protects the welder.

Educational overview only — not hands-on welding instruction, a safety program, or a substitute for training under a qualified welder. Follow OSHA, ANSI Z49.1, your employer's procedures, and the applicable welding code for your work.