Jan 02, 2014 · The high temperature required for hot forming can cause oxidation. It can also cause surface decarburizationa change or loss in steels carbon content. Most view decarburization as a defect, because the carbon loss makes the steel less stable, which in turn can cause a variety of problems with the products made from that steel. Effects of shot peening and artificial surface defects on it has been pointed out that the bending fatigue limit of high-strength steel specimens containing a small drilled hole [29, 30] or a semi-circular slit  can be increased by shot peening. The small defects with a depth of less than 0.1 mm for drilled holes and 0.15 mm for circular slit can berendered PRODUCT GUIDES - Central SteelProduct Guide - Steel Plate (contd) Form 1254 3/16/05 (Reprinted 5/27/15) Page 3 of 4 OVERVIEW Cold Reduced Plate Higher in quality (surface, flatness and shape). Maintains flatness after shearing, burning, or laser cutting and lower in cost. Flatness Defect Causes
Root Cause Failure Analysis - Understanding Mechanical Failures. Machines arent supposed to break, and mechanical components such as shafts, fasteners, and structures arent supposed to fail. But when they do fail, they can tell us exactly why. It may sound a little far-fetched, but experts say that the causes for more than 90% of all Sheet Metal FormingBending Force Requirement Punch Workpiece T Die W Force T = Sheet Thickness W = Width of Die Opening L = Total length of bend (into the page) UTS = Ultimate Tensile Strength of material () 2 UTS W LT F= Note:the notation used in the text (L, W) differs from that used in the previous development (b, L). The Effects of Laser Marking and Symbol Etching on the Apr 07, 2013 · A brief investigation of laser marking suggests that defects greater than 25 m are possible. A theoretical investigation further suggests that this is unlikely to cause issues with relation to fast fracture but is highly likely to cause fatigue life issues.
- Porosity:It is common type. In this defect, air bubbles or gases are present in the weld zone. The Spatter:Metal drop expelled from the weld that stick to surrounding surface is known as spatter. Slag inclusions:Slag inclusions are compound such as oxides, fluxes and electrode contains Incomplete fusion:In this types of welding defect gap is not totally filled by molten metal. It is due to Incomplete Penetration:It is occurs when the depth of the welded joint is insufficient.Under cutting:This defect occurs when base of metal melts away from the weld zone and the Under filling:Under filling occurs when the joint is not filled with the proper amount of molten metal.Inclusion:It is a defect in which several passes are made along a V-joint when joining thick plate Lamellar tears:This is mainly a problem with low quality steel. It occurs I plate that has a low Cracks:Cracks may occur in various location and direction in the weld area. The typical types of Sheet Metal Design Guide:Bending (Analyze from 8 Aspects Sheet Metal Design Guide:Bending (Analyze from 8 Aspects) Bending/Folding / 8 minutes of reading. Bending is a stamping process that uses pressure to force the material to plastically deform. Thereby forming a certain angle and curvature shape. Commonly used bends include V-bend, Z-bend offset bend and hemming bend etc.Some Failure Analysis Case Histories in Galvanized Steel Some Failure Analysis Case Histories in Galvanized Steel Products Dr. Zamanzadeh and Ed Larkin Matco Associates, Pittsburgh, PA Abstract:The three case histories presented in this paper concern defects and causes of failure associated with galvanized steel sheet material.