Surface Cleaning Methods: Power Tools

Question 1

Rotary wire brushes are available in two generic types.

Answer 1

Straight (In-line)

Vertical (Right-angle)

Question 2

Overworking the surface with a wire brush can be detrimental because excessive burnishing develops a ___ ___, which is a poor anchor for most coatings.

Answer 2

Polished Surface

Question 3

Rotary power wire brushes can also easily spread oil and grease over the surface; therefore ___ ___ is an essential step before power wire brushing.

Answer 3

Solvent cleaning

Question 4

Rotary wire brushes is considered less desirable than other forms of power tool cleaning because issues stemming from achieving a ___ ___ are more likely.

Answer 4

Polished Surface

Question 5

___ or ___ ___ are the most widely used impact tool.

Answer 5

Chipping or Scaling hammers.

Question 6

With Chipping/Scaling hammers a chisel is inserted into a power tool, air or electrically operated pistons transmit ___ to the chisel, then to the surface.

Answer 6

Impact

Question 7

___ and ___ chisels are also used.

Answer 7

Scrapers and specialty chisels.

Question 8

Use of scaling or chipping hammers is generally a 1___, ___ method to clean a surface, but when considerable rust scale or heavy paint formation is present, they prove to be 2___.

Answer 8

1. Slow, costly method.

2. Economical

Question 9

Using impact tools requires extreme care because it is too easy to cut into the surface removing ___ ___ and ___ ___ ___.

Answer 9

Removing sound metal and leaving sharp burrs.

Question 10

Impact tools may be used to remove some tight mill scale and surface rusting, but this generally is not the most ___ or ___ method because of the high possibility of gouging the metals, which then requires smoothing so coatings do not fail prematurely.

Answer 10

Practical or economical.

Question 11

Impact tools must be kept sharp or they can?

Answer 11

Drive mill scale and rust into the surface.

Question 12

Needle scalers or needle guns consist of several hardened steel rods that?

Answer 12

Vibrate against the surface.

Question 13

Needle scaling is slow and, similar to other power tools, burnishes while producing a ___ ___ ___.

Answer 13

Relatively smooth surface.

Question 14

Needle scaling, unlike impact tools or rotary tools, produces?

Answer 14

A surface profile.

Question 15

Needle scalers are effective on ___, ___ or ____ ___.

Answer 15

Welds, Corners or Irregular Surfaces.

Question 16

When removing lead based paint, needle scalers can be fitting with 1___ ___ to comply with 2___ ___ regulations.

Answer 16

1. Vacuum devices

2. Lead abatement

Question 17

Power tools used to remove hazardous coatings may be fitted with ___ ___and ___ devices.

Answer 17

Dust containment and collection devices.

Question 18

Rotary scalers can be used effectively on large areas to remove rust and scale. The require careful use to avoid cutting the metal to such an extent that ___ ___ extend far above the surface coating early coating failure due to insufficient coverage.

Answer 18

Metallic points

Question 19

Rotary Scalers produce a very ___ ___. Take care to ensure that all 2___ are covered by the coating.

Answer 19

1. Very Rough

2. Peaks.

Question 20

Piston Scalers operate similarly to 1___ ___ but the piston itself acts as the 2___ ___.

Answer 20

1. Scaling Hammers.

2. Scaling tool.

Question 21

With Piston Hammers:

The hammer piston is a circular shaft with the cutting end ___ ___ somewhat like a star chisel.

Answer 21

Cross-shaped

Question 22

Piston scalers are available with one, two, or three ___ in one operating tool.

Answer 22

Pistons

Question 23

Piston Scalers are available with as many as 1___ pistons for use on 2___ ___ surfaces such as steel decks.

Answer 23

1. 15

2. Flat, horizontal

Question 24

Grinders and Sanders are often used to prepare surfaces for coating. The machines powering these tools may be the same as those used for power wire brushing, with suitable ___ ___ or ___ ___ substituted for the wire brushes.

Answer 24

Sanding Disks or Grinding wheels.

Question 25

The ___ ___ ___ used with grinders and sanders is critical.

Answer 25

Abrasive grit size

Question 26

A Sanding/grinding disk/wheel that is too coarse can create a deep ___ ___ that may be unsuitable for good coating performance.

Answer 26

Anchor Profile.

Question 27

A Sanding/grinding abrasive that is too fine can cause the grinding wheel/sanding disk to ___ ___ in the ___ making it inefficient.

Answer 27

Clog early in the process

Question 28

Grinding is appropriate to remove ___ ___, smooth ___ ___, or round off ___ ___ or ___.

Answer 28

Weld splatter, smooth weld seams, or round of sharp edges or corners.

Question 29

Power grinders and sanders are frequently used to repair minor ___ ___.

Answer 29

Fabrication defects

Question 30

The ___ ___ produced by power grinders/sanders can be extremely good with complete removal of rust and mill scale; however, cleaning large areas with these tools is very expensive.

Answer 30

Anchor Profile.

Question 31

___ and ___ operated disk sanders are available.

Answer 31

Pneumatic and electrically operated

Question 32

Disk sanders have a ___ ___ or ___ ___ in contact with the metal to be cleaning.

Answer 32

Flat pad or abrasive surface.

Question 33

Some motor driven sanders have an ___ ___.

Answer 33

Orbital motion.

Question 34

The anchor profile varies by selection of the ___ ___ used with disk sanders.

Answer 34

Sanding Disk

Question 35

A rougher grit disk affects a ___ surface profile on the substrate. While the opposite is true for a finer grit disk.

Answer 35

Rough

Question 36

___ ____ are used to eliminate dust from the removal of old coatings, and are required by many authorities.

Answer 36

Vacuum Connections

Question 37

Because they are required by many ___ ___, many power tools now have vacuum lines to gather most of the dust as the tool operates.

Answer 37

Regulatory Authorities

Question 38

The effects of power tools on the surface remains the same when vacuum connections are used, but the equipment is ___ and more ___ to handle. However, acceptable results can be achieved.

Answer 38

Heavier and more difficult to handle.

Question 39

There are some new tools on the market that leave an ___ ___ as well as a clean surface. The MBX Bristle Blaster is one of these new tools.

Answer 39

Anchor Profile

Question 40

When the highest levels of surface preparation are required or specified, production of a ___ ___ is a mandatory part of the surface preparation operation.

Answer 40

Surface Profile

Question 41

Power tool cleaning in accordance with SSPC-SP 11 produces a greater degree of cleaning than SSPC-SP3, however, surfaces prepared according to SSPC-SP 11 should not be considered equal to surfaces prepared by ___ ___.

Answer 41

Abrasive blasting.

Question 42

Power tool cleaning to bare metal SSPC-SC 1__? produces surfaces that look like near-white or commercial blasts, they are not necessarily 2___ to abrasive blast cleaned surfaces

Answer 42

1. SSPC-SP 11 | 2. Equivalent

Question 43

Some of the things to consider are: 1. The substrate ___ prior to cleaning. 2. The solvent cleaning prior to ___ ___ cleaning. 3. The ___ where power tool cleaning is required. 4. The ___ to be applied to the existing surface. 5. The ___ after power tool cleaning is complete. 6. The ___ ___ during cleaning and prior to coating.

Answer 43

1. Prior to cleaning. 2. Power Tool 3. Area 4. Coating 5. Edges 6. Ambient Conditions.

Question 44

The inspector checklist prior to and after power tool cleaning should in, but not be limited to: 1. Check the ___-___ before power tool cleaning begins. 2. Check the surface to ensure that power tool cleaning is the ___ ___ ___. 3. Understand the ___ concerning power tool cleaning. 4. Know the ___ that require power tool cleaning. 5. Check the ___ to ensure the proper tools for the job are at hand. 6. Check the substrate after power tool cleaning to ensure there are no ___ ___. 7. Ensure that the ___ of the coating has been feathered to ensure adhesion of the coatings.

Answer 44

1. Pre-cleaning 2. Required surface prep. 3. Specification. 4. Areas. 5. Proper 6. Lifting Edges 7. Transition.