Safety Exam

Question 1

What type of light is emitted while arc welding?

Answer 1

• Ultraviolet light….not visible; most dangerous light
• Infrared light…not visible; felt as heat
• Visible light

Question 2

How does the light affect your body?

Answer 2

It can cause serious burns to the eyes/skin, vision loss, flash burn

Question 3

What precautions should be taken when working in confined spaces?

Answer 3

A ventilation system to prevent breathing in toxic fumes.

Question 4

When talking about regulators, what does the term “creep” refer to?

Answer 4

The term “creep” refers to rising pressure on the working side of the regulator.
An increase in outlet pressure typically caused by regulator seat leakage

Question 5

What is a regulator and what is its function?

Answer 5

A regulator reduces the high cylinder or system pressure to the proper lower working pressure.

Question 6

What are some different types of regulators?

Answer 6

• low pressure reg -cylinder reg
• high pressure reg -manifold reg
• single-stage reg -line reg
• dual-stage reg

Question 7

Is it safe to oil a regulator?

Answer 7

Noooooooo, oiling a regulator could cause a fire or explosion.

Question 8

What do the gauges represent on a regulator?

Answer 8

• Working Pressure Gauge: shows the pressure at the regulator and not the torch
• Cylinder Pressure: shows the pressure at which the gas is stored in the cylinder. Tells you how much gas remains in the cylinder.

Question 9

What metals emit toxic fumes?

Know at least five main ones.

Answer 9

Lead, Cadmium, Zinc, Chromium, Mercury, Copper, Beryllium

Question 10

What is metal fume fever? Cause? Symptoms?

Answer 10

Inhalation of Zinc oxide fumes can occur when welding or cutting galvanized material. Exposure to these fumes can cause metal fume fever. It has flu-like symptoms.

Question 11

What is Phosgene gas and how is it created while welding?

Answer 11

Phosgene is formed when UV radiation decomposes chlorinated hydrocarbon. Comes from solvents (such as degreasing material, refrigerants) that decompose in the arc.
This is why you should always clean your metal before welding!!!

Question 12

Why is it important to clean your work pieces before welding?

Answer 12

Cleaning the metal removes oil, paint, galvanized coating, degreasing material, etc that can produce toxic fumes.
Also, the cleaner the metal, the better the weld.

Question 13

Why is it important to have forced ventilation and when is it mandatory?

Answer 13

Small shops or shops with many welders (areas that have less than 10,000 ft^3 per welder or ceilings lower than 16 ft) require forced ventilation to remove toxic fumes.

Question 14

What is the best material to use for protective clothing while welding?

Answer 14

#1 leather
#2 wool
#3 100% cotton

Question 15

What are the types of fire extinguishers and how are they designated?

Answer 15

Type A-used for combustible solids (paper, wood, cloth) Green triangle
Type B-used for combustible liquids (oil, gas, paint thinner) red rectangle
Type C-used for electrical fires (motor fire, fuse box) blue circle
Type D-used for combustible metals (magnesium, zinc, titanium) yellow star

Question 16

What is the shop policy on eye protection?

Answer 16

Safely glasses much be worn in the shop at all times.

Question 17

What is the purpose of a flashback arrestor and a reveres flow check valve and how do they differ?

Answer 17

A reverse flowcheck valve prevents gases from accidentally flowing through the torch and into the wrong hose. A flashback arrestor will do the job of a reverse flow valve and will also stop the flame of a flashback.

Question 18

Acetylene gas is unstable at what pressure?

Answer 18

It is unstable at 30 psi; it could ignite on its own

Question 19

What is the maximum working pressure of acetylene gas?

Answer 19

15 psi

Question 20

What is stored in acetylene cylinders to absorb the acetylene gas and to help stabilize it?

Answer 20

Acetone

Question 21

What is withdrawal rate? What is the maximum rate of use of the total cylinder capacity per hour?

Answer 21

The withdrawal rate is the rate that the acetylene leaves the cylinder.
You should not exceed 1/7 of a tank per hour

Question 22

What is an MSDS and what is its purpose?

Answer 22

Material Safety Data Sheet
All manufacturers of potentially hazardous materials must provide detailed information regarding possible hazards resulting from the use of their products.

Question 23

Be able to summarize the proper use of the shear, iron worker, chop saw, and pedestal grinders, as well as all other equipment discussed in class.

Answer 23

Pedestal Grinder-be sure tool rest is adjusted at 1/16”. Always wear safety glasses. Do NOT wear gloves.

Question 24

Why is it important to stay hydrated during the hot summer months?

Answer 24

To prevent dehydration and heat stroke

Question 25

What is the proper procedure for cleaning up at the the end of class?

Answer 25

• return all borrowed tools
• returning unused electrodes, filler rods, or material to appropriate location
• put up your leads and foot pedal
• turn off machine
• purge gas from hose(s) of equipment
• back out regulator(s)
• grind tacks and welds off table
• sweep all the things