Welding by Don Geary & Rex Miller

Author:Don Geary & Rex Miller
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2011-09-07T16:00:00+00:00

FIGURE 9.10 Pick up the steel with a pair of pliers and examine the cooled puddle.

FIGURE 9.11 Be sure to check the back side of the steel to see how well the puddle penetrated through.

FIGURE 9.12 Practice puddling the steel with the torch until you can produce five straight and uniform puddles with good penetration.

Working with Welding and Filler Rods

Until this point we have been practicing only with a single piece of steel and a flame. Since much welding uses a welding or filler rod as well, this will be our next objective. Since working with a welding torch and filler rod requires that you use both hands, the following exercise should not be attempted until you have reasonably mastered working with a torch to create a welding bead by puddling.

At this point, some mention should be made about welding or filler rods used by the oxyacetylene welder. Often during the oxy-acetylene welding process, more metal than that which is melted by the torch is needed for a successful weld. To add more metal, it is common practice for the welder to use a welding rod that has the same, or very similar, properties as the base metal that is being joined.

Welding rods are available in many different alloys and designed for just about any type of joining task. Probably the most common type of welding rod is simply mild steel. These are commonly sold in 36-inch lengths and are copper coated to protect the rod from rust and corrosion while in storage. Uncoated, mild-carbon steel rods are also available. If there is an all-purpose welding rod, a mild-carbon steel rod is probably the one to buy. Diameters range from to ¼ inch. Your local welding supply house will have a selection of welding rods. You should buy an assortment of these mild-carbon steel, copper-coated rods. In most cases, you will use the ⅛-inch-diameter rods with the greatest frequency (Fig. 9.13).

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