Successful Welding of Sheet MetalsBlog | July 24th, 2018
Steel alloy plating has passed a rigorous series of tests. The microcrystalline structure of the plate metal sections is flawless and certain to support a rated load. Now it’s the welding technique that’s drawing the project director’s attention. It all begins with the finest equipment, plus a procedural perspective that ensures a successful sheet metal join every time. Come on, let’s dive deep into the welding techniques used here.
A Flawless GMAW Process
A Gas Metal Arc Welding (GMAW) rig is called into service. Seams travel smoothly down the heat-affected zones between the plates when this technique is wielded with skill. Use improperly, however, all sorts of undesirable results loom. Keep the torch nozzle moving and don’t whip it clumsily around the weld area. Melt-through slip-ups occur when this advice isn’t followed. Furthermore, the sheet metal is going to warp and lose shape if too much heat is applied to a single site. Stick to the following tips:
- Use small-diameter wire feed rolls
- Source Argon as the inert shielding gas
- Select the correct electrode polarity
- Prepare the HAZ
- Use heat-dissipating backing bars
Finely Detailed Sheet Metal Welding
Think of sheet metal welding as a detail-oriented process. Like an artist sharpening his sketching pencils, the goal is to lay down a series of refined lines. Tidy and clean, those lines incorporate a healthy measure of mechanical strength. Just as a pencil is sharpened, we select a thin feed wire, which is easier to control and faster to melt. Next, the Argon-based shield gas protects the HAZ (Heat-Affected Zone) from oxidization. Travel speed is maintained after these baselines have been established. By moving the weld head at a calculated speed, the seams are applied evenly. Moreover, there’s less chance of material melt-through and plate warping.
Site Preparation is Everything
Select the welding equipment that works best with a ferrous or aluminium-based alloy. There are a few to choose from, including GTAW (Gas Tungsten Arc Welding) and a handful of pulsed variants, which are designed to cool the weld pool faster and really add a degree of finesse to the operation. The equipment still isn’t ready for use yet, though, not until the metal has been cleaned of dirt, grease, and oxide coatings.
Welding techniques rule supreme here, but travel speed execution isn’t going to yield a successfully executed weld seam if the metal isn’t clean. Scour the site with a wire brush, use a correctly selected current polarity, and match the wire with a pure shielding gas. With these measures addressed, the welder braces the sheet metal against a series of heat-dissipating backing bars and starts showing off his welding technique.
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