Hot tearing

The reasons for those lowfrequent emission events are flow processes during the child mold filling or friction processes between the casting part and the child mold. Investigations where, using radioscopy, hot tears could be detected show that the time based... [Pg.16]

Fig. 13 Time based ampiitude spectra of a casting part with a hot tear in correiation with radioscopy images...

Defects such as hot tears or laps, quench cracks, localized overheating during stress rehef, and corrosion may occur during the tubemaking process (154). Magnetic particle, ultrasonic, and visual inspection techniques are used to ensure that relatively few tubes enter service with significant defects. [Pg.96]

Cores should be made with a minimum amount of binder or volatEe compounds and should also be readEy coEapsible because copper is susceptible to hot tearing. [Pg.248]

BS 1490 Major alloying conslituenis (nominal "It) Condition strength (N/mm ) Sand Chill Fluidity Resistance to hot tearing Pressure tightness Machin- ability Resistance to corrosion Protective anodising Comments... [Pg.651]

I turned away from him and buried myself among the icy linen at the furthest edge of the bed that he might not feel the tremors that forced hot tears up into my throat and spilled them onto the pillow. [Pg.282]

I can t bear it. It s unbearable, as remembering Adam so clearly was not, and a hot tear slides quietly from the corner of my eye and falls onto my jacket, a small, clean stain. [Pg.303]

Initial attempts to make synthetic rubber similar to NR date back to mid 1800s. Modern synthetic polyisoprene is designed to be similar to natural rubber in structure and properties. Although it has lower green strength, slower cure rates, lower hot tear, and... [Pg.91]

Tearing Bad mould design, low hot tear strength of compound, overcure and careless removal of moulded article. Avoid sharp edges, improve compounding technique, cure at optimum level and use simple devices for removal. [Pg.233]

Hot tears form when casting sections are constrained by the mold from contracting as they cool near the end of solidification. Hot tears are caused by a number of factors, but poor casting design is the primary cause. Castings should be designed so that solidifying sections are not subject to tensile stresses before they are fully solidified. [Pg.247]

Hot tears Inherent Ferrous castings Radiography primary choice Liquid penetrant method for nonferrous samples... [Pg.142]

Yttrium or misch metal for improving the oxidation resistance of OFHC copper and elimination of hot tearing in leaded brasses... [Pg.9]

Before World War II (1939-1945) natural rubber was used for practically all rubber applications. Natural rubber is preferred in many products because of its superior building tack, green stock strength, better processability, high strength in non-black formulations, hot tear resistance, retention of strength at elevated temperatures, better resilience, low heat build-up, fatigue resistance, and better dynamic properties. Rubber products are broadly classified as dry rubber products and latex based products [60]. [Pg.431]

Although the emphasis in recent years has been on the role of low sulphur contents in promoting hydrogen cracking, it is also possible for a sulphur content which is relatively high to give liquation cracks in the HAZ and for these minute cracks or hot tears to act as potent nuclei for the nucleation of hydrogen cracks. Steels... [Pg.37]

Go away. Sing " Gerald started to hum his lullabies again. Then his throat turned to stone, blocking the music inside. Hot tears trickled down his cheeks. [Pg.81]

A wide range of manufacturing operations calling for measurement of properties as diverse as hot tear strength (for moldings extracted from heated molds), compression modulus (as a measure of porosity), coefficient of friction (for surface-treated components such as latex gloves and windscreen wiper blades) and adhesion strength (for rubber-to-fabric or rubber-to-metal bonds)... [Pg.286]

Uses Crosslinking agent for actylic/vinyl resins PVC plastisol comonomer (reduces initial vise, and oil extractability. and improves ultimate hardness, heat distort., hot tear strength, and stain resistance) adhesion promoter hardener used in cast acrylic sheet and rod, contact lens, elastomers, ion exchange resins, dental polymers, adhesives, coatings (paper, plastic), cosmetics, paints, sealants, photopolymers, electronics (photoresists, solder masks)... [Pg.1251]

Polyethylene, linear low density Propylene/MA copolymer hot tear strengthener PEG-3 dimethacrylate... [Pg.5365]

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