Wire feed and Sheilded metal arc welding

What the recommended shade number for GMAW at 175 amps?

Shade no. 12

What can be done prior to welding aluminum to prevent release of toxic ozone gas?

Cross draft , clean material

Which process is easily adapted for use as semi-auto or mechanized or fully auto ?

Submerged arc welding

Which mode of metal transfer in GMAW is best for thin and conditions where fit up is inferior?

Short circuit transfer

For applications with high deposition rate, what is the recommended amount of argon needed to achieve spray transfer?

80% argon

Which process utilizes output change between peak values?

Pulsed GMAW

When using pulsed GMAW what happens if wire speed increases?

Pulse frequency increases

What is an advantage of FCAW- S vs. FCAW - G

Does not require gas, better for outdoor

With FCAW, which gas should be used to improve arc stability when done indoors?

Argon CO 2 mix

In MCAW what is the main compound of the core chemistry?

Metal powder

Why are the flux additives in the core of MCAW wires researched and changed often?

Reduce harmful fumes

Which welding process establishes are beneath bed of granular flux with heat of arc

Melting base metal and flux?

Submerged arc welding

In which position can SAW be used?

Flat and horizontal

Which type of discontinuity is likely to occur if shielding gas is lost during wire feed?

Porosity

Most common and detrimental defect in short circuit GMAW?

Lack of fusion

Most wire feed processes use which type of power source?

Constant voltage

Which variable in arc welding meets electrode?

Arc length

Most significant advantage of inverter power source?

Requires much less iron core and windings. High frequency

When using cv power source what happens when the arc length changes?

Voltage and current change

Which type of equipment is used to make wire feed welding more portable?

Inverter power source, spool gun

Why are knurled drive rolls used for FCAW?

reliable wire feed, arc stability and weld quality.

Advantage of water cooled gun?

allows higher amperage welding for longer periods without overheating the gun.

During GMAW the gun gets too hot but the welding parameters are set correctly. How to correct the problem?

Allow gun to rest

What is the purpose of drive rolls in wire feeder of GMAW power source?

Grip welding wire and push it through gun liner and out to the contact tip

How is flux applied during saw?

granular flux bed over the joint ahead of the welding arc.

Which GMAW process variable provides greatest amount of penetration?

Welding current

Which GMAW process variable best controls arc length to get vide and flat bead?

Arc voltage

What indicates that GMAW wire is correct?

matches the base metal, process parameters, and produces defect-free welds.

AWS ER-70S-G (GMAW). G means what?

Chemical composition of the wire

E70T1. 70 means what?

Minimum tensile strength in KSI

What unit is CSA filler metal tensile strength based on?

megapascals (MPa)

Which metal alloy is specifically accounted for in saw wire classification?

Manganese

Which flux to prevent hydrogen cracking during saw?

Low hydrogen flux

Which shielding gas is commonly used for mild/low alloy in GMAW?

Argon and CO 2

Which shielding gas is used on rust , paint, prime?

CO 2

When establishing gas flow rate what is the recommended flow for 13mm nozzle?

10-15 litres per minute

What must be checked on regulator, flow meter ?

Cylinder pressure, Outlet/working pressure, Flow rate, Leaks, gauges and hoses

When setting drive roll pressure what happens if there is too much pressure?

wire can be crushed or deformed, inconsistent wire feed, damage to liner or contact tip

When setting up GMAW wire feeder how should wire wire be be loaded into cable?

Straight into cable liner

Recommended fitting method for welding with aluminum wire

Spool gun or push-pull system

What is done prior to welding aluminum?

Clean base metal

What is the range at which peak current should be established?

high enough to melt the wire and drop one droplet into the weld pool per pulse,

Which shielding gas should be used when welding aluminum with electrode ER4043/ ER53/56 GMAW pulse?

Argon

Principle consideration when welding stainless steel with wire feed process?

Clean material and protect against fumes

Most common shielding gas for FCAW-G?

Argon and CO 2

What will reduce weld pool contamination for aluminum GMAW-P?

Clean base metal, proper shielding gas

Main concern when welding stainless steel with FCAW-G?

Fume exposure

What should be avoided when applying surfacing weld deposit?

Excessive heat, incorrect travel spend/angle

Which characteristic of MCAW permits a higher deposition rate?

Metal powder in core of wire

Which shielding gas for MCAW?

Argon CO 2