What is root pass and hot pass?

A root bead and hot pass are generally the minimum amount of weld that must be done before the crane / side boom etc can be released and the weld can then be left to completely cool and be filled and capped at a later time / date.

What does pass mean in welding?

weld bead
A single progression of welding or surfacing along a joint or substrate. The result of a pass is a weld bead.

What is clean root pass in welding?

The root pass is the initial pass deposited after the pipe is fit-up and tack-welded together.

What is the meaning of root pass?

[′rüt ‚pas] (metallurgy) The first weld bead deposited in a multiple pass weld. Also known as root sealer bead.

What comes after a root pass?

Hot pass: The weld pass that immediately follows the stringer (root) pass. HOT PASS had different opinion and they are as below mentioned. It is to fill the weld bevel. It is to Melt and float out the wagon tracks left after the root pass.

What are the electrodes used in root pass filling pass and capping?

The root pass is made with a 5/32” (4.0mm) diameter electrode. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity. The hot pass is made with a 5/32” (4.0mm) diameter electrode.

What electrode is used in root pass?

cellulosic electrode
The root pass is made with a 5/32” (4.0mm) diameter electrode. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity.

What is the current setting for root pass?

For root pass welding, the current control should be set as high as necessary while the open circuit voltage (OCV) is set as low as possi- ble, while still permitting the arc to strike without sticking. In practice, it is not obvious by looking at the dials on the machine how to accom- plish this.

What is root opening?

[′rüt ′ō·pən·iŋ] (metallurgy) In welding, the distance between members at the root of the joint.

What is a root pass in welding?

Root pass is a first pass welded to start weld. After that all passes are subsequent passes. You need to take smaller dia electrodes for root pass while welding a bevel edged butt joint to prevent root face melt out. In some cases root pass requires some kind of Non destructive testing.

How to tell if a Hot Pass is SMAW or GTAW?

The WPS will determine if the hot pass is SMAW or GTAW but if the procedure is (very common) a TIG root/hot and then stick it out, the main reason that the hot pass is TIG is so that you do not blow through the root pass. SMAW on top of the TIG root can be done without blow through but it is more risky.

What is a GTAW root/Hot Pass?

The WPS you reference- GTAW root/hot pass- SMAW fill and cap- is a regularly used procedure in many industrial applications from refineries, to offshore oil rigs, pulp mills, refrigeration, boilers and many others.

What is the difference between SMAW and GMAW?

SMAW stands for “shielded metal arc welding” and is usually better known as Arc welding. GMAW stands for “gas metal arc welding” and is usually better known as MIG welding. SMAW has a flux covered electrode which produces a gases shield (CO2) when heated and relies on this for protection from oxygen and nitrogen in our atomosphere.