Ball peening

Training must be the eentral theme. The days of the meehanie armed with a ball-peen hammer, serewdriver, and a ereseent wreneh are gone. More and more eomplieated maintenanee tools must be plaeed in the hands of the meehanie, and he must be trained to utilize them. 

Hammer used primarily to drive and remove nails, as well as to pound on devices such as chisels claw hammer, rubber mallet, ball-peen hammer... 

Platinum can be used in the form of thin sheet or screen. Platinum wire can be welded to a small square of sheet or screen by placing it in position on a metal surface, heating to red heat with a torch, and striking lightly with a small ball peen hammer. The platinum wire can then be sealed into the end of a piece of soft-glass tubing. Electrical contact can be made by copper wire spot-welded to the platinum lead wire before the glass-to-metal seal is made. 

FIGURE 8-22 Common hammers (a) claw and (b) ball peen. 

The hammer test consists of tapping the cylinder sidewall with a light blow using a half-pound (0.23 kg) ball-peen hammer or equivalent. A cylinder will normally have a clear ring. A dull ring would indicate internal corrosion, liquid, or accumulation of foreign material in the cylinder. Such cylinders must be inspected internally. 

Wire cutter Coarse sandpaper Rolling mill or file Round form (mandrel or appropriately sized dowel) Wooden or rawhide mallet Planishing or ball-peen hammer Needle-nose pliers... 

Several index tests have been proposed to estimate citmpressive strength. The CMRR employs an indentation test proposed by Williamson (42). The exposed rock face is struck with the round end of a ball peen hammer, and the resulting characteristic impact reaction is compared to the chart shown in figure 1. .. It is the nature of the indentation, not its magnitude, that is important. ... 

Recently, a combined pack aluminizing and ball peening process was developed by the authors group (collaborative research at USTB and UOA) to produce nanostmctured aluminide intermetallic coatings on carbon steel, stainless steel and/or Ni-based superalloys at a relatively low operating temperature (440-600°C) and in a short time (15-120 min) (see Fig. 7.3) (Zhan et al, 2006a,... 

Zhan Z., He Y, Wang D. and Gao W. (2006d), Nanocrystalline iron-aluminum coatings assisted by ball peening processes , Int J. Nanosci., 5, 775-80. 

Fig. 7.73 Fracture probability of polished and shot peened samples (N3208), respectively, determined in static and cyclic ball-on-plate tests. Note that in case of the static tests of the shot peened samples the capacity of the test equipment was exceeded [23], With kind permission of Elsevier...

Shot peening, defined as shot blasting with small steel balls driven by a blast of air, is a method of removing defects for highly critical anchors, and is specifically recommended for use on anchors subjected to high-cycle fatigue. It is not deemed necessary for other applications. 

Shot peening (post-deposition processing) Densifying a ductile film by repeatedly striking it with hard balls, usually entrained in a high velocity gas stream. Peening compacts the film and closes porosity. 

---