101 Flashcards
What is plasma?
Super heated gas which causes the gas to ionize, this is considered a 4th state of matter
What polarity does PAC use?
Straight polarity(DCEN)
When talking about PAC, what is dross?
Re-solidified oxidized molten metal
Which type of CAC-A is the most economical electrode? Why?
Large diameter DC copper coated electrode because you can have continuous operation without stub loss
What PSI do you run compressed air when using CAC-A
80PSI- 100PSI (550KpA- 700KpA)
What is the maximum stickout with CAC-A?
7” maximum
What is the problem if the main hoist line hangs off centre to the raised boom?
The crane is not Level
If a signalman has one thumb up and is bringing his fingers in and out what does this signal mean?
Boom up load down
Why are synthetic ropes stronger than natural fibres?
Because they have no breaks in threads and strands
What is WLL (working load limit)?
The weight that can be safely lifted by a wire rope
What safety factor must be used when lifting people?
10:1
What does ANSI mean?
American national standards institute
What hold acetylene in solution?
Acetone
How do you know the contents of a air bottle?
By reading the label (not the colour of the bottle)
What is not considered a part of the regulator?
The dials
Where are flashback arresters placed?
At the regulators
What is the average pressure limits on hose lines?
400 PSI
When using a oxy-fuel heating torch what is the difference in flame from a cutting flame?
When setting the acetylene you must be out of the smoke range
While cutting with an oxy-fuel torch if the top edge of the metal is gone behind the cut what is the likely cause?
Either the pre-heat flames are too long or to close to the plate, or it is set to an oxidizing flame
What ferrous metals can not be satisfactorily cut with an oxy-fuel torch?
Cast iron, and stainless steel
If there are three tubes running to the tip of a cutting torch what kind of torch is it?
A tip mixing torch
what is a benefit of machine oxy-fuel cutting?
High degree of accuracy and repeatability
What is a scarfing tip used for?
Removes minor imperfections during foundry and casting work
When cutting thin material what must you change during cutting?
Inclination
What are the three key elements of WHMIS?
Worker education, product labelling, and MSDS
What classification and classes does WHMIS cover?
Compressed gases (Class A), flammable materials (Class B), oxidizing materials (Class C), poisonous and hazardous materials (Class D), Corrosive materials (Class E), dangerously reactive materials (Class F)
Who supply’s the MSDS?
The supplier, anytime a hazardous material is shipped it must be accompanied by a MSDS
How must gas cylinders be transported?
Tightly and properly secured in an upright position
What must be done before entire a confined space?
Make note of egress locations and check oxygen and hazardous gas levels with a gas detector (sniffer)
What is the minimum number times air must be changed in an hour?
4 times an hour
What is the lower explosive limit?
The minimum concentration of a flammable gas required for a flas or explosion with an ignition source
What are the components of the fire triangle?
Fuel, air(oxygen), ignition source(heat)
What is a class d fire?
Combustible metals
What is the supplier label attached to?
The container that a hazardous material is shipped in
What causes arc eye?
Ultra-violet light
When working in a public environment who’s responsibility is it to protect the public from adverse effects of welding?
The welder, use screens and warning signs
How do you treat hypothermia?
Raise body temperature, using warm decaffeinated drinks, and warm clothing
What is the maximum decibel level that you can work for eight hours without hearing protection?
85 decibels
When cutting with oxy-fuel what shade range do you use?
Shade #4-#6
If after welding you see little light spots what is the likely cause?
Using a shade level too low for the process you’re using
What does PASS stand for?
Pull the pin
Aim the nozzle
Squeeze the trigger
Sweep
