Welding

What is the single best thing you can do to protect yourself from welding fumes?

• Wear a welding visor or helmet

• Put up a welding screen or shield

• Use local or exhaust ventilation

• Store welding materials and equipment properly

Where should welding equipment and supplies be stored when not in use?

• Below ground level, inside buildings

• Below ground level, outside buildings

• Not below ground level, inside buildings

• Not below ground level, outside buildings

In arc cutting, what melts away the metal?

• A gas flame

• Intense heat of electric arc

• An oxygen jet

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-4

Above is a cross section of a typical fusion-welded joint. Select the correct labelling for each zone.

• fusion zone, heat-affected zone (HAZ), weld interface and unaffected base metal zone.

• fusion zone, heat-affected zone (HAZ), unaffected base metal zone and weld interface.

• heat-affected zone (HAZ), fusion zone, weld interface and unaffected base metal zone.

• weld interface, heat-affected zone (HAZ), fusion zone and unaffected base metal zone.

Tags

NGSS.HS-PS3-4

The grain structure of the weld appears to depend mainly on three factors except for

• composition (solute content)

• shape of the electrode

• solidification parameter

• shape of the weld pool

Tags

NGSS.HS-PS3-4

Weld pool_____________is important in the development of grain structure and dendrite growth selection process.

Tags

NGSS.HS-PS3-4

List ONE (1) possible solidification modes (morphologies) that are possible in welding aside from planar growth and cellular growth

At higher speeds, the weld pool becomes kite-shaped and grains form a _________________ pattern.

The weld pool becomes teardrop shaped at high welding speeds and _____________at low welding speeds.

In heat-affected zone (HAZ), metal has experienced temperatures ____________melting point, but high enough to cause microstructural changes in the solid metal.

• below

• above

Tags

NGSS.HS-PS3-4