Self-Test B-5.2: Describe Cutting, Brazing and Soldering Techniques
Complete Self-Test B-5.2 and check your answers.
- If cutting 13 mm (½ in.) plate or thicker, hold the cutting tip to the plate.
- The cutting oxygen lever should be depressed when the metal has been preheated to a colour.
- The vertical lines created on the cut edge by the cutting action on metal are called .
- Name four factors that can affect the quality of an oxyacetylene cut:
- What is required prior to welding on closed containers, or on any structure where flammables or other explosive substances are likely to be present?
- tests for combustibility must be performed.
- area must be flushed with hot water and detergent to remove chemicals.
- fire safety watch should be posted, and the area should be protected from sparks and flames.
- Tests for combustibility must be performed by a qualified person and posted for review.
- Never cut or weld on , as it explodes when heated.
- List three reasons why flux is used in preparing a joint for soft soldering:
- The active range for soft solder fluxes is between °C and °C (or °F and °F).
- According to the American Welding Society, brazing, also known as hard soldering or silver brazing, is a process that is performed above °C (or °F).
- According to the American Welding Society, soldering, also known as tinning or sweating, is a process that takes place below °C (or °F).
- A “B” size acetylene tank holds the equivalent of ft³ of gas (@ 14.73 psia).
- Acetylene is unstable when stored at pressures exceeding 15 psig. To ensure its safe storage, a porous material is contained within an acetylene cylinder and the gas is dissolved in a liquid such as .
Answer Key: Self-Test B-5.2 is on the next page.
