Bahadır Coşkun 030070008 (9th Week)

Hard Facing : (08.04.2011 03:06)
Hard facing is a surfacing technique in which alloys are applied as welded deposits to substrate metals. What distinguishes hard facing is that fusion occurs between the coating and the substrate, whereas the bond in thermal spraying is typically mechanical interlocking that does not stand up as well to abrasive wear. Thus hard facing is especially suited to applications to requiring good wear resistence.
(Groover M.P., Fundamentals of Modern Manufacturing: Materials, Processes, and Systems, 3rd Edition, p.685)

Furnace Brazing : (08.04.2011 03:06)
The popularity of furnace brazing derives from comparatively low cost of equipment, the adaptability of the furnace, and the minimal jigging required. With many brazing assemblies, the weight of the parts alone is sufficient to hold them together. With other configurations, one or two rectangular blocks of metal are all fixturing needed.
Furnace brazing is used extensively where parts to be brazed can be assembled with the brazing filler metal preplaced near or in the joint.
Furnace brazing is used extensively when:
the parts to be brazed can be preassembled or jigged to hold them in correct position;
the brazing filler metal can be placed in contact with the joint;
multiple brazed joints are to be formed simultaneously on a completed assembly;
many similar assemblies are to be joined;
complex parts must be heated uniformly prevented the distortion that would result from local heating of the joint area
(Schwartz M.M.,Brazing, for the engineering technologist, 2003, p.59)

Rivet Bonding : (08.04.2011 03:06)

Rivet-bonding is a hybrid of adhesive bonding and mechanical joining employing rivets as fasteners. Shown schematically in Figure 10.9, the combination of rivets driven and set though structural adhesive has been used to considerable advantage in helicopter manufacturing as an example. The rivets tend to carry andy transient out-of-plane loads (whether anticipated or unexpected) to protect the adhesive from failing in peel. On the other hand, the adhesive acts to spread loading and soften stress concentrations added energy needed to open the bonded plus welded or fastened joint area), which improves both the crashworthiness of automobiles and their ride quality (through vibration damping and noise abatement) and (10) complete interface bonding to improve load transfer.
(Messler R.W., Joining of materials and structures: from pragmatic process to enabling, 2004, p.514)

Flow Coating : (08.04.2011 03:06)

Flow coating essentially involves saturating a part suspended from a moving rail by the use of two or more spray heads. The excess paint drains from the part as it moves through the spray booth and is collected and recycled. Compared with actually dipping the part in paint. it has the adventage of reaching corners without being impeded by pockets of entrapped air
(Weldon D.G., Failure Analysis of Paints and Coatings, 2009, 127-128)