TIG Aluminum Welding Settings Reference

What the parameter rows cover

This table summarizes selected aluminum fillet-weld rows from Hobart Brothers’ Aluminum Welding Guide. Each row keeps plate thickness and welding position tied to AC current, argon flow, electrode, filler, cup and travel speed. The 1/16-inch, 1/4-inch and 3/8-inch rows are the cases shown here. The guide labels these as typical parameters, so use them as a starting comparison for the described fillet weld rather than as a guaranteed setting for every aluminum part.

The source distinguishes flat, horizontal, vertical and overhead positions. At 1/16 inch, flat, horizontal and vertical share one listed parameter row, while overhead has a separate row. At 1/4 inch, the table separates flat, horizontal/vertical and overhead. At 3/8 inch, each position has its own row and the number of passes changes. Match the row to the actual position rather than copying current from thickness alone.

Read each setting with its units

Current is an AC amperage range, not a single exact knob setting. Argon flow is in cubic feet per hour; electrode and filler diameters are in inches; travel speed is inches per minute; and approximate filler consumption is pounds per 100 feet. The table also gives gas-cup inside diameter and pass count. Keep these units visible when transferring a value to a machine sheet. The ranges describe typical values and do not guarantee a bead profile or mechanical property.

For example, the 1/16-inch overhead row lists 65–90 A, a 3/32-inch filler, 1/16–3/32-inch tungsten, a 3/8-inch cup, 20 cfh argon and 8–10 in/min travel. The flat/horizontal/vertical row for the same thickness uses a 70–100 A range and 16 cfh. The distinction shows why position matters even for the same thickness.

Position and thickness change the setup

At 1/4 inch, Miller lists 240–295 A in flat position, 220–265 A in horizontal or vertical, and 230–275 A overhead. The recommended gas flow is 30 cfh for the first two rows and 35 cfh overhead. At 3/8 inch, the rows use two or three passes, and the source says preheat is optional up to 250°F. The current and filler use increase with thickness, while position changes the ranges and pass count.

These relationships are useful for checking whether a proposed setup is in the neighborhood of the source chart. They should not be extrapolated to an unlisted thickness or position. Do not interpolate beyond the listed rows or assume that a larger electrode automatically makes a procedure suitable. Confirm equipment output, joint design, fit-up and thermal control with the qualified welding procedure.

Prepare aluminum and follow the procedure

Aluminum oxide and surface contamination affect arc behavior and weld quality. Follow the approved cleaning method and use clean tools reserved for aluminum. Select the alloy-compatible filler and verify the base-metal temper. Heat-treated aluminum can lose strength if exposed to excessive or prolonged preheat; Miller’s guide cautions about this in the table note. Preheat should therefore follow the qualified procedure, material requirements and code—not be added simply because a chart permits it.

The settings table does not define joint preparation, acceptance criteria, shielding-gas purity, interpass limits or welder qualification. It also does not cover every aluminum alloy, thickness, joint geometry, machine waveform or AC balance/frequency setting. Use the project’s WPS/PQR and the applicable code when qualification is required. If the source chart conflicts with the approved procedure, the approved procedure governs.

Use this as a reference, not a WPS

Hobart Brothers labels these as typical parameters for fillet welds and gives approximate filler consumption for one-side welds. This is a manufacturer guide, not a procedure qualification record. Confirm the applicable row and current manufacturer guidance before work. The table should help orient a setup review, while a qualified procedure establishes production requirements.

Do not use this table alone to approve a structural, pressure-retaining or code-controlled weld. The base alloy, temper, design loads, joint detail, filler classification and inspection plan all matter. A welding engineer or other responsible qualified person should choose the procedure and verify that the machine, consumables and operator qualifications meet the governing requirements.

Source and scope

Source: Hobart Brothers, Aluminum Welding Guide, Typical TIG Parameters for Fillet Welds in Aluminum. Use the source edition and conditions stated in the table.