Ag Mech 2 - 4.04 (Part 2)

If a welding job needs the heat concentrated in a smaller area, which welder should be selected?

• AC Shielded Metal Arc Welding (SMAW)

• TIG (tungsten inert gas)

• MIG (metal inert gas)

• DC reverse polarity

Welding from the bottom to the top is done to make a:

• flat weld.

• tack weld.

• spot weld.

• vertical weld.

Kay should use the #12 or #14 welding helmet shaded lens recommended for TIG and MIG welding because they are:

• darker than the lens used for SMAW.

• lighter than the lens used for SMAW.

• the same as recommended for SMAW.

• the same as the lens used for oxyacetylene welding.

If Roberto tacks two pieces of sheet metal together on each end and in the center prior to welding, it will help to:

• add strength.

• reduce strength.

• prevent warping.

• increase warping.

When one welds with an oxyacetylene unit, pipe should always be:

• tacked.

• pounded flat.

• welded in a vertical position.

• welded in a overhead position.

Vertical welding with oxyacetylene is usually done:

• any way that is most convenient.

• from the middle down.

• from the bottom up.

• from the top down.

Clay can weld in all positions, but he has problems welding pipes. Why is welding pipes more difficult?

• Constant changes in position are required.

• Pipes can have different diameters.

• Metal pipes are rusty and dirty.

• Amperage lacks uniformity.

If Chris makes a corner fillet joint, the two pieces of metal are welded together:

• at right angles forming a groove with the 90° angle.

• standing vertically, end to end or side to side.

• with one piece flat on top of a second piece.

• lying flat, end to end or side to side.

If a bead welded with an MIG welder is too wide, the width should be corrected by:

• decreasing the welding speed.

• increasing the welding speed.

• increasing the current.

• lengthening the arc.

What type of welding is difficult because of constantly changing positions?

• flat

• horizontal

• lap

• pipe