- Author
- Maupin, A. R. | Swanger, W. H.
- Title
- Strength of Sleeve Joints in Copper Tubing Made With Various Lead-Base Solders.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
- BMS 83, May 5, 1942, 11 p.
- Keywords
- copper | plumbing | lead (metal) | tests
- Abstract
- A previous investigation on soft-soldered sleeve joints in copper tubing for domestic plumbing lines and other uses dealt with joints made with two tin-base solders. To supplement that investigation, the present one on similar joints made with various lead-base solders was conducted. Solders of the following types were used: lead-silver, lead-tin-antimony, lead-cadmium, high lead-low tin, and high-purity lead. Tensile tests at room temperature (short-time tests) were made, together with long-time tests at temperatures ranging from 85 deg to 325 deg F. The information from the latter tests is much more useful than the results of short-time tests in evaluating soldered joints for service. Consideration must always be given also to possible bond deterioration of the soldered joint at elevated temperatures. On the basis of the results of the first investigation, joints in copper made with tin-base solders were considered satisfactory for general use, provided the temperature did not exceed 250 deg F. The results of the present study have shown that similar joints made with lead-base tin-free solders can be used with safety at temperatures as high as 325 deg F.