This is a tricky steel repair welding technique

2021-11-11 08:30:51 By : Ms. Nikki Pan

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In all welding techniques, vertical welding-up or down-presents a unique complexity.

In collaboration with our welding consultant, Joel Ort of Hortonville, Wisconsin, DTN/Progressive Farmer put together this list of steps that you can use to meet the challenges of vertical welding. We used Ort's Miller MIG welding machine to complete this process. But the technique described here is also applicable to other welding techniques.

- set up. This is the most important step. Welding vertically up and down is an anti-gravity movement. Think about it: you convert the welding wire into molten metal and glue two pieces of steel together.

You need to do two things here. First, reduce the voltage and current intensity by 10% to 15% from the settings you normally use for this type of work. Ort suggests that the second step is to "practice, practice, practice again" on scrap metal.

-Bottom-up or top-down. For most vertical welding jobs, you need to start from the bottom and move up. This is a direction that can penetrate well into metals that are 1/4 inch or thicker. When you use thinner materials, you may wish to weld from top to bottom. This will help prevent burn-through because you need to pull the torch away from the weld. It is best to practice welding again. Depending on the type of metal used, this will help you determine the best welding direction and voltage and current settings.

-Gun angle. When welding from the bottom, tilt the gun slightly downward, about 5 to 15 degrees from the vertical. When welding from top to bottom, tilt the torch down by 5 to 15 degrees, but the position should be such that the torch is at an angle above the molten pool.

--welding. When welding, the angle of the gun creates a hole in which you can continue to add material. Use back and forth knitting patterns. Some welders recommend that you pause for each pass to allow time for the weld to cool down. This method allows you to create a welding pass on the previous welding pass. Like bricklaying, one layer is stacked on top of the other-the weld remains under the gun. On thicker materials, you may need to "root processing". This is an initial welding pass, and then another pass at the top.

-Weld it down. For a vertical downward weld, create an upside-down "U". You also need to pause at the end of each pass. Make sure to keep the arc at the leading edge of the puddle. You don't want the molten metal to run before the arc.

You can contact Dan Miller at dan.miller@dtn.com

Follow him on Twitter @DMillerPF

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