Pipefitting and Welding Period 2 (CND) Flashcards
Who is responsible for the personal safety of everyone in the shop?
The individual worker
Exposure to infrared light without proper eye protection can cause?
Retina damage
Temporary blindness is caused by the eyes being exposed to high levels?
Visible light
Which type of material offers the best protection against sparks and molten slag?
Leather
What type of gloves are recommended for oxyfuel cutting?
Dry-tanned leather gauntlet style
When would you use protective screens if you were performing an oxyfuel cutting operation?
If there were other workers nearby
Which type of radiant energy can cause welding flash?
Ultraviolet light
Permanent eye damage in the form of cataracts or retina damage may result from over exposure to which harmful light ray?
Infrared
Welding with wet gloves increases the risk of?
Electrical shock
When welding on metals plated with cadmium you should have on?
appropriate respiratory protective equipment.
Which metal, when heated or welded, can produce metal fume fever if the fumes are inhaled?
Zinc
Fumes are?
Small condensed particles of metal that have vaporized.
When oxygen reacts with ultraviolet light from welding, the gas produced is?
Ozone
File handles should be on files because?
They reduce the risk of injury.
The most versatile type of square is the?
Combination square
What is the recommended length of a wrap-a-round fro marking a straight line around a pipe?
Twice the pipe circumference.
C-clamps are sized according to the?
Distance the clamp opens.
Files are classified by the?
Length, Shape and Cut.
Why is filling done only on the forward stoke?
Because dragging the file backwards will break the teeth.
A safety specification to consider when selectin a grinding stone or disc is?
The RPM rating of the stone or disc.
Safe cutting of angle iron in a cut-off saw requires?
One vertical leg of the angle iron against the adjustable block of the clamping device.
It is a pictograph used to indicate the desired type of weld?
A Weld Symbol.
It is an assembled symbol giving all the information necessary for preparing and/or welding the joint.
A Welding Symbol
The tail on a welding symbol is used for?
Information that cannot be put into a symbol form.
List 3 weld symbols that have one leg perpendicular to the reference line?
Filled weld symbol,
Bevel groove weld symbol,
J groove weld symbol.
A field weld is shown on the welding symbol by a?
Solid black circle.
A ferrous metal has a high content of ?
Iron
Which statement describes a non-ferrous metal?
Contains little or no iron and is usually non-magnetic.
A metal that is a red or yellow color is most likely what type of metal?
Copper or Brass
What is the normal colour for steels and cast irons?
Silvery grey
If a metal that has fractured shows a dull grey appearance in its internal structure, with no bending before breaking, it is most likely?
Gray Cast Iron.
In using a chip test to identify a metal, what would a smooth continuous chip indicate?
A soft material like aluminum
How is cast iron distinguished from low carbon steel in a spark test?
The sparks given off by cast iron are short with red bursts near the grinder.
How can using a new hand-held file give you an estimate of a metal’s hardness?
If the file bites into the metal easily, it is likely a soft material.
Describe the oxyfuel cutting process?
Oxyfuel cutting is a controlled process of rapid oxidation in which steel is heated to its kindling temperature and a high-pressure jet of pure oxygen is directed to the heated area. Metal exposed to the oxygen oxidizes and is blown away by the oxygen jet stream.
Which ferrous-based metals cannot be cut satisfactorily with an oxyfuel cutting torch?
Cast irons and Stainless steels
The space created when a piece of metal is cut is called the?
Kerf
On a combination cutting torch, the oxygen valve on the torch handle must be?
Fully open
The larger the orifices of a cutting tip the?
Thicker the plate that you can cut.
Which metals can be readily cut using the oxyfuel cutting process?
Mild steels
The ability of a metal to permanently deform under lad without breaking is known as?
Ductility
The ultimate pull that a material will withstand is called?
Tensile strength
Dynamically loaded structures are subject to?
Reversals of stress
Which is the best example of a dynamically loaded structure?
The boom on a crane making a lift, and then swinging the load.
Electrodes used in a SMAW are often called?
Consumable electrodes
Electrode specifications are written by?
CSA and AWS
In the AWS classification for SMAW mild steel electrodes, what does the last digit represent?
The major ingredient in the coating and recommended current for the best results.
What do the first two digits in the AWS classification for carbon steel SMAW electrodes represent?
As-weld minimum tensile strength
In the CSA numbering system for welding electrodes, what does the prefix letter E represent?
Electrode
What is one characteristic of an E6010 electrode?
Deep penetration into the base metal.
What is one purpose of the flux coating on a welding electrode?
To protect the molten weld puddle from atmospheric contamination.
What is one function of the slag produced from electrode coatings?
To prevent the weld from cooling to rapidly
What is the main purpose for keeping low hydrogen electrodes dry?
To minimize the possibility of hydrogen-induced cracking
To weld thin materials you would likely select an electrode with?
A small diameter core wire.
The National Plumbing Code of Canada approves extracted tees for ?
Water distribution systems.
Tee-pulled joints for gas installations must be ?
Supplied by an approved manufacture and not made on-site.
The 2 main tools used to make the mechanical tee-pulled joint are the ?
T-drill power unit and The notcher and dimpler.
Each collaring head is designed for ____ size of tube to be drilled and formed.
One
The ______ is part of the collaring head that is designed to pull up the collar of the tee.
Forming pin.
larger mechanical tee-pulled joint tools have ______ speeds, with the ________ speed used to extract the collar.
2 speeds,
Lower/Slower speed.
To properly install the branch pipe into the collar, you must align the _______ with the ______ of the pipe.
DIMPLES with the RUN of the pipe.
According to the National Plumbing Code of Canada, the types of copper that can be used for mechanical tee pulled joints are?
Types L and K
To braze an extracted tee you must use filler metal with a melting temperature of not less than?
540C or 1000F
Flux for high-temperature soldering shows a definite change in __________________ as the temperature of the copper to which it is applied is heated.
Characteristic/Chemical consistency/Look
Brazing rods come may or may not be?
Flux-Coated.
Brazing rods are expensive to purchase because they have a ?
High silver content.
Some filler rods come with a ___________ coating; the manufacturer gives the rod the name Silfos..
Phosphorous coating.
The 2 types of torches commonly used for silver brazing are _______ and _______ torches.
Turbo and Oxyacetylene torches.
Two types of brazing tips used on oxyacetylene are the _________ and the ____________.
Swedge and the Straight bore tip.
The recommended type of flame for silver brazing is the _______________ which is rich in fuel.
Carbonizing/Reducing flame.
The size of flame for silver brazing should be?
2-1/2” to 3” times the size of the neutral flames inner cone.
When you anneal copper you cause it to ?
Soften the tube.
To make consistent bends on tubing, you should use _______ or _________.
Lever or Mechanical benders.
When bending a larger size of tube, the better bender to use is the?
Mechanical type.
List 2 methods of placing a groove on a pipe?
Roll groove, for thin wall pipe.
Cut groove, for pipe over schedule 40.
List 3 types of pipe that can be used for groove and shoulder system?
Steel/Galvanized,
Copper,
Stainless steel.
Gaskets are marked by a colour stripe to identify their ?
Application and the products that can use them.
To choose the correct gasket, refer to the ?
Manufacturer’s specs.
Groove and shoulder joints can be _______________ to drop a line so as to create a slight slope.
Rotated, Twisted or Turned.
Pipe joint deflection is caused by ?
Anchoring the pipe and not permitting the pipe to extend when the pressure is built in the pipe.
List 3 methods for coping with expansion and contraction in a groove and shoulder system.
Build expansion loops,
Install and expansion joint,
Set up each joint so that the pipe end extend.
When forming the collar you have to?
Slow down coming up
When drilling into the pipe to form the collar you ?
Go quick to avoid skipping
The collar height needs to be ?
3 times the wall thickness of the pipe your using
Brazing material or silver solder has a melting point of ??
1000 degrees f
What does flux prevent ?
Oxidization
Silver brazing rod is known as ?
Silfos
Swedge tips and straight tips produce ??
Long thin pointed inner cone, produce a short thick bulbous inner cone
Acetylene flame is recommended to be ?
21/2x to 3x
