Before we start we should discuss basic
housekeeping. If you want good professional results, you need a clean
workpiece. Everything from rust to paint to oil can
contaminate your weld, so make sure your workpiece is clean and you’ve selected
the proper shielding gas and established a flow rate of between twenty and thirty
cubic feet per hour. Remember the chart in your Millermatic®. Is your work cable
attached to the workpiece or work table? Without that connection, you won’t get a
welding circuit. Unless you have a Millermatic with auto set you will have to set
your voltage and wire speed for the job. Check the parameter chart one more time.
It’s time to put on your safety gear and helmet. Using two hands and in a
comfortable position, you’re ready to start. How you hold the gun depends on
the type of metal you’re working on and what type of weld. For thin metal such as
auto body panels, it’s suggested that you position the gun at about a 10 to 15
degree angle. At this angle a push travel provides the best results. If the metal
is thicker such as steel gates, reverse the travel direction because a pole
travel angle will provide deeper penetration. The most common types of
weld joints: the butt joint, T or fill it, the lap, the edge, and the corner joint.
For t-joints and lap joints, use a 15 degree angle. For butt joints, edge joints and
corner joints, you’ll need to be perpendicular to the weld joint. Keep the
contact tip about 3/8 to 1/2 inch from the weld surface. This is called the
stick out and if you are further or closer than this you may not get the
results you want. You begin each weld by making tack welds to secure your pieces
together. Pull the trigger for about 2 seconds. While you pull the trigger, make
a slight rocking motion from piece to piece. For best results, make a tack weld
about every 3 inches. When your tack welds are completed, proceed to weld
using the appropriate direction to minimize distortion. Stay on the leading
edge of the puddle. This is accomplished by watching the weld puddle and
adjusting your travel speed accordingly. For best welding results, you need the
right voltage, wire feed speed and gas flow. Set your voltage and wire speed at
the recommended setting from the parameter chart and fine-tune as you
need. When it comes to travel speed and correct gun angle, it’s up to you.
Your Millermatic is designed to give you years of quality work. And remember,
the more you practice, the better your welds.