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2. Penetration (firestop) - Wikipedia

   en.wikipedia.org/wiki/Penetration_(firestop)

   A penetration, in firestopping, is an opening, such as one created by the use of a cast-in-place sleeve, in a wall or floor assembly required to have a fire-resistance rating, for the purpose of accommodating the passage of a mechanical, electrical, or structural penetrant.

3. Controlled low strength material - Wikipedia

   en.wikipedia.org/wiki/Controlled_low_strength...

   CLSM as a highway construction material is becoming more widespread throughout the United States.Data received from questionnaires sent by the Pennsylvania Department of Transportation in 1991 and the Transportation Research Board (TRB) in 1992 indicated that approximately 30 states had some experience with the use of flowable fill, and at least 24 states have a specification for flowable fill.

4. Undercut (welding) - Wikipedia

   en.wikipedia.org/wiki/Undercut_(welding)

   Another reason is if a poor technique is used that does not deposit enough filler metal along the edges of the weld. A third reason is using an incorrect filler metal, because it will create greater temperature gradients between the center of the weld and the edges. Other causes include too small of an electrode angle, a dampened electrode ...

5. Joint compound - Wikipedia

   en.wikipedia.org/wiki/Joint_compound

   Kitchen renovation spackling to cover holes and tape between sheetrock boards Drywall with joint compound applied.. Joint compound (also known as drywall compound, drywall mud, joint cement or mastic) is a white powder of primarily gypsum dust mixed with water to form a paste the consistency of cake frosting, which is spread onto drywall and sanded when dry to create a seamless base for paint ...

6. Constructionline - Wikipedia

   en.wikipedia.org/wiki/Constructionline

   Constructionline has long faced criticisms from construction bodies. Research by Salford University in 2003 reported past criticism of the number and type of public sector clients using it and low levels of commitment to the system: a third of 900 clients signed up to the scheme were "sleeping" clients; some businesses signed up to Constructionline "to curry favour with government", while ...

7. Spot welding - Wikipedia

   en.wikipedia.org/wiki/Spot_welding

   Typically the sheets are in the 0.5 to 3 mm (0.020 to 0.118 in) thickness range. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is that a large amount of energy can be delivered to the spot in a very short time (approximately 10–100 milliseconds). [ 2 ]