Cutting Chapter 6 Flashcards
Who do you go if you are given the task to weld something and you dont have the credentials.
General Foreman
Superintendent
Project Manager
Quality Engineer
What is the typical ASME welder qualification test?
To weld pipe in the 6G using an open root.
What qualifies the ASME welder qualification test?
The welder to weld the pipe and platein all positions.
The welder only qualifies on f3 electrodes on both plate and pipe if…
If the f3 electrodes are used all the way out.
If f3 electrodes are used for welding the root and f4 electrodes are used for filler, the welder qualifies to weld pipe or plate with f4 as long as what?
Backing is used.
What does the letter G designate?
A groove weld
/What does the letter F designate
FIllet weld
For plate welding, what are the positions designated by?
1, 2, 3, 4
1
Flat Position Welding
2
Horizontal Position Welding
3
Vertical Position Welding
4
Overhead Position Welding
A sample is placed in a tensile testing machine and is pulled until it breaks.
Tensile Test
Tensile Test is sometimes used to determine what?
If the the weld performs as well as the base metal.
Tensile Test in most cases is performed to determine specific characteristics of the weldment, such as…
strength
ductility (stretch)
A nondestructive method for locating defects that are open to the surface
Liquid Penetrant Inspection (PT)
PT can’t detect what
internal defects
Properly done at all times, visual inspection can detect what?
More than 75% of discontinuities before they are found by more expensive and time-consuming nondestructive examination methods
Prior to welding, the base metal should be what
examined for conditions that may cause weld defects.
Inspection: What should also be inspected
Dimensions, including edge preparation should also be confirmed by measurements.
What should be made asap when problems or potential problems are found before proceeding any further?
Corrections
A uniform concave or convex face, although a slightly nonuniform face is acceptable?
Ideal Fillet
The convexity of a fillet weld or individual surface bead will be approximately —— times the actual face width or witdth of the individual surface bead plus——
.07
1/16”
A groove melted into the base metal beside the weld
Undercut
Undercut is the result of———removing more metal from the joint face than is replaced by weld metal
the arc
On multilayer welds, undercut may also occur at the point where a layer ——
Meets the wall of a groove
Many welders confuse incomplete joint penetration with what
Incomplete fusion
It is possible to have good penetration without complete root fusion.
T
The failure of a welding process to fuse, or join together, layers of weld metal or weld metal and base metal.
Incomplete fusion
Caused by improper welding techniques or contamination.
Most porosity
May cause inadequate shielding gas to be formed . As a result, parts of the weld are left unprotected.
Improper welding techniques
Produce Porosite 3 things
Oxy in air
Moisture in flux
Moisture on base metal that dissolves in the weld pool can become trapped.
May be located throughout single-pass welds or through out several passes in multiple-pass welds
Uniformly Scattered Porosity
A localized grouping of pores that results from improperly starting or stopping the welds.
Clustered Porosity
May be aligned along a weld interface, the root of a weld, or a boundary between weld beads.
Linear Porosity
Normally extends from the root of the weld toward the faace. aka Wormholes
Piping Porosity
WPS variable are identified as ——- or ——
Essential
Non essential
Items in the welding procedure specification that cant be changed w/o requalifying the welding procedure.
Essential Variable
Items in the WPS that may be changed within a range identified by the code, but that dont affect the qualification status.
Nonessential Variable
Ex of Essential Varianle
Filler Metal Classification Material Thickness Joint Design Type of Base Metal Welding Process
The WPS os qualified for use by welding test coupons and by testing the coupons in accordance with the applicable code. A test weld is made and test coupons are cut from it. The test coupons are used to make tensile tests, root bends, and face bends as required by code. The test results are then recorded on a document aka…
PQR Procedure Qualification Method
A private organization that doesn’t actually prepare standards, Instead it adopts standards that it feels are of value of public interest.
American National Standard Institute
