Chapter 11 SMAW Flashcards
What is the function of shielding gases?
They keep oxygen, dirt, nitrogen and other airborne contaminants out of the weld area
What is the diameter of the electrode?
It is the diameter of the uncoated wire
Using the electrode identification system that was developed by the American Welding society, what do the letter E mean?
E means covered electrodes for SMAW
What do the first two, and sometimes three numbers from the left indicate?
The minimum tensile strength in carbon steel and low-alloy electrodes
What unit is tensile strength measured in?
in thousands of pounds per square inch (psi) or in megapascal (MPa)
What does the second number from the right indicate?
Recommended welding positions and/or type of weld
What do the numbers 1,2,3 and 4 represent regarding weld type?
1- all positions
2- flat welding and horizontal fillet welds
3- flat position only
4- flat, horizontal, overhead, or vertical down
What is a welding procedure specification (WPS) used for?
to specify welding requirements for commercial jobs such as bridges, pipelines, or steel structures
The weld bead should be ____________ times the diameter of the electrode
2-3 times
True or False: Is E6012 and E6012 a deeper penetration than E6010 and E6011?
False: E6010 and E6011 produces good penetration on thick material
What would happen if electrode coatings got damp?
They will not work properly. Hydrogen in the weld and in the heat-affected zone weakens the weld.
Why should you store low-hydrogen electrodes in an electrode drying oven
To prevent the absorption of hydrogen into the electrode covering.
Describe SMAW electrodes.
they are solid, round, metal wires that are cover coated.
Electrode wires are made from _____________
metal alloys. The wire used for most steel electrodes is a low carbon steel.
What metal is used for AWS A5.1?
Carbon steels
What metal is used for AWS A5.11?
Nickle and nickel alloys
Which AWS electrode specification number provides information about electrodes to weld low alloy steels?
AWS A5.5
List three purposes of the electrode covering
- Create a protective gas shield around the arc and molten metal
- Create flux to clean impurities from the molten metal
- Create a hard slag covering to protect the molten weld base as it cools
- Improve mechanical and chemical properties of the weld by adding alloying elements to the weld metal
- Provide additional filler metal to the weld
- Determine the current type and polarity specifications of the electrode
Why would you add iron powder to electrode covering compounds?
To deposit more filler metal into the weld in a given length of time to reduce welding time and decreases welding cost.
_____________ in a completed weld lowers it strength.
Hydrogen. Low hydrogen electrodes deposits a minimum amount of hydrogen into the weld.
In the SMAW electrode designation E6010, what does the E stand for?
Electrode
In the SMAW electrode designation E6010, what does the 60 stand for?
Medium tensile strength
In the SMAW electrode designation E6010, what does the 1 stand for?
Welding position, 1 indicates all positions
In the SMAW electrode designation E6010, what does the second 0 stand for?
Coating and polarity. 0 stands for high cellulose sodium
In the SMAW electrode designation E10016-D2 what does the first 3 digits (100) stand for?
Minimum tensile strength
In the SMAW electrode designation E10016-D2 what does the fourth digit (1) stand for?
Welding position (1 is all positions)
In the SMAW electrode designation E10016-D2 what does the fifth digit (6) stand for?
Coating and polarity
In the SMAW electrode designation E10016-D2 what does the D2 stand for?
It shows whether alloys have been added. D2 means 0.25-0.45% Mo, 1.25-2.00% Mn
