Chapter 2 welding theory Flashcards
What are the most common and painful injuries that occur in welding?
Burns are the most common and painful injuries you can get while welding.
What three classifications are burns divided into?
First degree burns, second degree burns and third degree burns.
What burns are reddish in color, tender, and painful and do not involve any broken skin?
First degree burns are reddish in color, tender and painful; they also do not involve any broken skin.
What are the two types of light that can cause burns?
Ultraviolet, infrared, and visible.
What problems can reflected welding light cause?
Eye injuries and burns.
What should be done if welding can not be moved away from other workers in the area?
If welding cannot be moved away from your coworkers, use welding curtains to screen off the welding arc and absorb welding light
When must eye protection be worn?
Eye protection must be worn at all times in the shop (such as safety glasses with side shields).
Which welding and cutting processes may produce undesirable by-products that can affect your respiratory system thereby might require some type of protection?
Harmful dusts, fumes, mists, gases, smokes, sprays, or vapors produce undesirable by-products that affect your respiratory system from welding and cutting. The protection against this would be to clean your area of surface contaminants before starting work, and confinement of the operation to outdoor or open spaces.
What is a possible way of telling if a bolt, nut or hinge is plated with cadmium?
You can tell by looking at the surface of the certain item, it gives the surface a yellowish-gold appearance.
How is ozone produced by welding?
It is produced by ultraviolet radiation in the air in the vicinity of arc welding and cutting operations.
Why must welding be done outside or in a well ventilated area?
Welding should be done outside or in a well ventilated area because of the excessive fumes, ozone, or smoke may collect in the welding area; ventilation should be provided for their removal. This would protect the individual from respiratory issues (etc).
List some (3) of the metals that may give off dangerous fumes and always require forced ventilation when being welded.
Zinc, lead and copper.
Clothing made from what materials must be avoided in the welding shop?
Clothing from synthetic materials, including nylon, rayon, and polyester must be avoided at all times in the shop.
Why must butane lighters and matches not be carried in a welding shop?
They can catch fire/ explode if subjected to welding heat or spark
When must the valve protection cap be on a cylinder?
Generally, it prevents the valve from being broken off if the cylinder is knocked over.
Why must an acetylene cylinder be stood upright for 4 hours after it has been stored on its side?
If the cylinder has been in a horizontal position, using it too soon after it is placed in a vertical position may draw acetone out of the cylinder. Acetone lowers the flame temperature and can damage the regulator or torch valve settings.
List the (4) types of fire extinguishers and tell what type of fire they can be used to fight.
Type A: Combustible solids (articles that burn), such as paper, wood, and cloth.
Type B: Are used for combustible liquids, such as oil, gas, and paint thinner.
Type C: Electrical fires
Type D: Fires involving combustible metals
What can happen if fuel or oil gets on oxygen and acetylene regulators?
They can explode when connected to the cylinders for use. Even
