Method of soldering stainless steel pipes by using soft solders
AssigneesSenju Metal Industry Co., Ltd., Nisshin Steel Co., Ltd.
InventorsToshihiko Taguchi, Takehiko Ito
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Abstract
A method of soldering stainless steel pipes by using soft solders, which comprises the steps of preparing a pipe joint having a diametral clearance of from 0.05 to 1.00 mm, filling said clearance with paste solder, heating said pipe joint to melt said paste solder, and feeding additional soft solder into said clearance immediately after said paste solder is molten by said heating. Particularly, the paste solder comprises from 20 to 80% by weight of powder solder and from 20 to 80% by weight of a flux composition comprising a mixture of from 5 to 50% by weight of phosphoric acid (H.sub.3 PO.sub.4) and from 95 to 50% by weight of ammonium dihydrogenphosphate (NH.sub.4 H.sub.2 PO.sub.4) dissolved or suspended in a vehicle.
Claims7
A method for joining stainless steel pipes by using soft solder the ythe steps of:
- preparing a pipe joint having a diametral clearance of from 0.05 to 1.00 mm,
- filling said clearance with paste solder, said paste solder comprising from 20 to 80% by weight of a flux composition and from 80 to 20% by weight of powder solder, and said flux composition comprising a flux component of a mixture comprising from 5 to 50% by weight of phosphoric acid (H.sub.3 PO.sub.4) and from 95 to 50% by weight of ammonium dihydrogenphosphate (NH.sub.4 H.sub.2 PO.sub.4) in a vehicle;
- heating said pipe joint to melt said paste solder;
- and
- feeding additional soft solder into said clearance immediately after said paste solder is molten by said heating.
Dependencies are inferred from the claim text.