Welding and Cutting

No, it is just beyond red hot. Almost in a plastic state.

The pulsed-arc metal transfer typically shifts between 300-400 pulses per second. This frequency helps control heat input and results in a more stable arc and reduced spatter during welding.

Each one has its own characteristics that make it useful. Ex. In GTAW (Tig) welding, in order to weld mild and stainless steel and all ferrous metals you would use DCEN. However to weld Aluminum, Magnesium and other nonferrous metal you would use AC. Consult The American Welding Society for further information.

When done correctly it doesn't matter where a weld is made.

Class Code for welding

which lens filter grades are acceptable when arc welding

Silicon is used to lower the viscosity of the weld puddle. This allows better flow of the molten weld puddle.

Vertical up welding is preferred in most instances as better penetration is achieved and the slag does not run down into the arc. Down hand welding is mostly used on thin material so as not to burn thru the metal. Travel speed is usually increased also.

We were taught that the arc temperature can exceed 5,000 degrees F. Amperage settings can increase or reduce this temperature.

dcrp = direct current reverse polarity

formula for a 6" 45 degree lateral onto a 6" main

Not exactly sure what you're asking but this may be the info you want. When stick (SMAW) welding as you progress with the bead directly under the arc a slight depression forms. Called a crater. When you get to the end of the bead if you pull the electrode away the crater is there which promotes crater cracks. By pausing at that point and actually backing up a little the crater is filled. With practice the weld is the same height and width all the way to the end. Hope this is what you are asking about.

It depends on the material of the pipes

F numbers for consumable identification and A Number is deposited weld metal analysis

Manual Metal Arc Welding

not a college degree but if you do it could help alot

Type your answer here... no

Penetration Test Report

Reverse. Using a D C machine, electricity travels from the negative post to the positive post. Connecting the electrode holder to the positive post and the ground clamp to the negative post means the current flows from the work to the electrode - reverse polarity. In A C machines it doesn't matter which post the electrode holder is connected to.

Primarily when brazing cast iron. Nickel rods are available to arc weld cast iron but in most cases it has to be preheated and it takes experience to prevent cracking. Using oxy-acet provides a means to preheat, maintain the temperature, and braze. Welding, brazing, and silver soldering with oxy-acet have become lost arts. Most common metals can be welded with this process including steel and aluminum.

You can have visual inspection, x-ray, ultrasound, magnetic testing. The seam can be ground, polished and tested with a stain marker. You can weld a test piece and have it submitted to destructive testing where it's pulled or bent until failure.

anoid

Gas Metal Arc Welding Most folks call it MIG

Unless it has been changed it is: 1G flat 2G horizontal 3G vertical 4G overhead 5G pipe

Remedies to prevent slag inclusions -

Avoid atmospheric contamination using proper welding procedure e.g. adequate Shielding Gas

Proper removal of slag from weld bead surface

using wire brush

Redesigning the weld joint to permit sufficient space for manipulation of the puddle of molten weld material