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Old 13 November 2016, 07:24   #11
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Originally Posted by beerbelly View Post
i think that stainless is more widely used because of its ability to withstand corrosion in a salt water environment ally if its not protected by a coat of powder/paint will be eaten away. oh some folk tow ski,ers wakeboards ect from the a frame as well as hang ornaments off it
You can make boats and engine parts out of Ally (of the right grade) so I don't think corrosion is necessarily the killer. I though vibration induced fatigue was more of an issue for ally A-frames though? it's also likely that the relative cost makes s/s more attractive (not only raw material but equipment/skill to weld ally).
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Old 13 November 2016, 07:30   #12
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You can make boats and engine parts out of Ally (of the right grade) so I don't think corrosion is necessarily the killer. I though vibration induced fatigue was more of an issue for ally A-frames though? it's also likely that the relative cost makes s/s more attractive (not only raw material but equipment/skill to weld ally).
I think if the ally was hard anodised it would last better. as for vibration I was under the impression that stainless would be more likely to fail as it work hardens which would make fractures a possibility hence why stainless generally isn't used in areas prone to vibration .but I may be wrong(I usually are)
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Old 13 November 2016, 08:45   #13
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ive made two frames myself now, the first was stainless and was always flexible even with plenty of bracing pieces, so was never really happy with it. the one i have now is aluminium (powder coated black) and is as solid as a rock, so much that it feels part of the boat. it carries all the usual electronics, incorporates large cleats for tying alongside, and is fitted with stainless eyes on each side for hanging rope ladders off. as for ease of welding, personally i find aluminium a lot easier than stainless to weld, its just that the equipment costs a lot more to buy
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