Carbon Content
0.05% - 0.15% Carbon Content
What is Low Carbon Steel?
For the Week #2 cracking lab we heated the 1095 flat bars to what temperature range according to the Lab procedure?
What is 1,333-1,450 degrees F.?
OR
What is the Curie and/or Lower Critical Temperature?
Marc and Nick are racing to complete their t-Joint, Horizontal filet welds by increasing their Amperage and used a longer arc length with their trusted E7018.
What defect along the top toe of the weld did they likely get?
What is Undercut?
The tendency of a material to fail suddenly.
What is Brittleness?
Jody (leather jacket, deep Southern Drawl) is the main character of this trusted internet welding site, with good videos.
What is Welding Tips and Tricks.com?
0.45% - 0.95% Carbon Content
What is High Carbon Steel?
The presence of this element in "high" amounts contributed to weld cracks in the Week #2 lab.
What is Carbon?
High carbon steels are more susceptible to _________ than low carbon steel since more carbon is available to react with other elements and form gases under some welding conditions
What is Porosity?
The resistance of a material to a force which is acting to pull it apart.
What is Tensile Strength?
If welding on Q&T steels, always anneal before welding. What's Q&T?
What is Quenched and Tempered?
0.30% - 0.45% Carbon Content
What is Medium Carbon Steel?
HAZ
What is the Heat Affected Zone?
These striking weld indications outside the weld zone are big no-no for pipe welders!
What are Arc Strikes?
The physical effect of a stress, usually evidenced by stretching or other deformation of the material.
What is STRAIN?
The ability of a material to resist indentation, scratching or abrasion
What is hardness?
1090 Flat Bar.
What is 0.90% carbon steel?
Welding on high carbon steel that doesn’t stretch very much coupled with differences in expansion rates between the weld metal and the base metal can lead to what defect?
What is weld Cracking?
A dip or low spot that is underfilled, typically at the end of a weld.
What is a CRATER?
The resistance of a material to a repeated or alternating stressing without failure:
What is FATIGUE Strength?
The stress point at which permanent deformation results.
What is YIELD strength?
DAILY DOUBLE!!
4140 Chrome - moly.
What is 0.40% Carbon Content?
DAILY DOUBLE!!
When we weld high carbon steels we almost always will be using a filler metal with lower tensile strength than the base metal. We do this in order to have a ductile weld that will not be stressed to the point of fracture. What did we call this filler metal in last weeks PowerPoint?
What is an undermatching filler metal?
In order to get a lot of welding filled in, you crank up your wire speed without increasing volts, what weld discontinuity is likley on the bottom toe of this horizontal fillet weld?
What is a cold lap or overlap?
The ability of a material to be permanently deformed without failure:
What is DUCTILITY?
DAILY DOUBLE!!
I ( Scott) took a welding prep for certification from this current LBCC Welding Instructor in 1987.
Who is Dean Dowless?