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KeyWallet - Free Password Manager Forum Index » » Program Features » » Stainless steel bellows and flange tube welding tips
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Author Stainless steel bellows and flange tube welding tips

Joined: Oct 21, 2015
Posts: 6032
From: shanghai,shanghai
  Posted: 2018-07-25 23:47

Overview: Stainless steel bellows are widely used and have applications in oil, water and gas pipelines, and most of them still have some pressure. Such thin corrugated tubes are often welded, and because of the thinness (about 0.2 mm), welding is difficult. Welding methods include welding, brazing, and the like. Here, the tungsten argon arc welding of stainless steel bellows and stainless steel flanged tubes is introduced. The key to welding is to prevent burn through.

Preparation before welding:
1. Clean the stainless steel corrugated pipe to be welded and the oil on the flange pipe. If it is cracked and leaked at the weld, the original weld bead should be cleaned off, and the metal luster should be ground at the straight pipe of the flange pipe. The straight pipe of the bellows is too thin to be ground and polished, and the sand is brightened by hand sand. Just fine.

2, welding assembly: the best assembly clearance is 0, due to processing and manufacturing errors, sometimes the gap is too large, the welding is easy to burn through, the solution can be overlapped on the flange pipe straight (usually 3 ~ 5mm) heap One layer of welding, machined to 0 ~ 0.05mm gap or hand grinding. If the sleeve does not go up, the small outer diameter of the straight tube of the flange tube should be small or small until it is suitable.

3, welding machine selection: WS315 type, using DC positive connection.

4, welding consumables selection: ER308, Ř0.8mm

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