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Rifles, Reloading, Optics, Equipment
Reloading
Couple questions on bullet weld
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<blockquote data-quote="Hugnot" data-source="post: 2421634" data-attributes="member: 115658"><p>Cold Welding</p><p></p><p>[URL unfurl="true"]https://en.wikipedia.org/wiki/Cold_welding[/URL]</p><p></p><p>Cold welding as defined ^ does not happen with ammo. Bullets may be stuck in necks, but "cold welding" did not make it happen. I have never seen factory ammo loaded with new clean brass have stuck bullets; the same for hand loading with new brass. Any debris like powder residue or lubricants will prevent the true "cold welding" phenomena from happening by introducing dissimilar atoms between two surfaces that are sort of different (copper jacket alloy & brass). The bullet and cartridge neck materials would be dissimilar enough, and the phenomena is one that occurs in a vacuum like in satellites and stuff flying in space having like materials in contact. Cold welding does not require melting, just contact between like metals, apparently the tiny little atoms pickup on each other upon contact in a vacuum with no strange atoms intervening.</p><p></p><p>Bullets do get stuck in cases, my guess is that corrosion makes it happen, like nitrate salts in powder residues. When pulling bullets that have been seated for months in cases having dirty inner necks it is a good idea to seat the bullets down a tiny bit like .010 to break any corrosion caused bond. If stuck, a POP may be heard. Then extract the bullet. Stuck bullets are sort of like variations in neck tension.</p><p></p><p>I like to chuck the right sized nylon brush in my cordless and spin/clean the debris (powder residues, nitrates, lead, & whatever) from the insides of necks. I lube the insides of necks with graphite lock lube when using an expander. This helps to prevent neck run-out.</p><p></p><p>I have had the neck portion of a case stuck inside a chamber after firing. My guess is the bullet was bonded to the inside of a dirty neck by corrosion and the same corrosion weakened the brass case. Possibly there may be some electrolysis going on between mostly copper bullet and the 70% copper, 30% zinc brass with the nitrate salts containing potassium. Copper & zinc are sort of similar elements. "Cold welding" is not electrolysis.</p><p></p><p>Stuck bullets are real bad for accuracy. Stuff like ^ interests me!</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2421634, member: 115658"] Cold Welding [URL unfurl="true"]https://en.wikipedia.org/wiki/Cold_welding[/URL] Cold welding as defined ^ does not happen with ammo. Bullets may be stuck in necks, but "cold welding" did not make it happen. I have never seen factory ammo loaded with new clean brass have stuck bullets; the same for hand loading with new brass. Any debris like powder residue or lubricants will prevent the true "cold welding" phenomena from happening by introducing dissimilar atoms between two surfaces that are sort of different (copper jacket alloy & brass). The bullet and cartridge neck materials would be dissimilar enough, and the phenomena is one that occurs in a vacuum like in satellites and stuff flying in space having like materials in contact. Cold welding does not require melting, just contact between like metals, apparently the tiny little atoms pickup on each other upon contact in a vacuum with no strange atoms intervening. Bullets do get stuck in cases, my guess is that corrosion makes it happen, like nitrate salts in powder residues. When pulling bullets that have been seated for months in cases having dirty inner necks it is a good idea to seat the bullets down a tiny bit like .010 to break any corrosion caused bond. If stuck, a POP may be heard. Then extract the bullet. Stuck bullets are sort of like variations in neck tension. I like to chuck the right sized nylon brush in my cordless and spin/clean the debris (powder residues, nitrates, lead, & whatever) from the insides of necks. I lube the insides of necks with graphite lock lube when using an expander. This helps to prevent neck run-out. I have had the neck portion of a case stuck inside a chamber after firing. My guess is the bullet was bonded to the inside of a dirty neck by corrosion and the same corrosion weakened the brass case. Possibly there may be some electrolysis going on between mostly copper bullet and the 70% copper, 30% zinc brass with the nitrate salts containing potassium. Copper & zinc are sort of similar elements. "Cold welding" is not electrolysis. Stuck bullets are real bad for accuracy. Stuff like ^ interests me! [/QUOTE]
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Couple questions on bullet weld
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