Copper Tube Brazing Services

Copper Tube Joining, Brazing, Soldering, & End Tube Manipulation Services Provided on a Production Basis to Customer Print

 

About Tube Joining Using Brazing

Brazing is a method of fabricating copper tubing that renders the connection largely leak-tight. In the process of joining the tube ends, high temperatures cause an "annealing" of the tubing, allowing the localized area to become slightly softer at the site of the braze and tube ends can be fused together. Optimal brazing temperatures range from twelve hundred degrees to fifteen hundred (1,200F - 1,500F). Silver is used for brazing on the cooler end of the spectrum and copper phosphorus is used on the upper end. The "solidus" temperature is where the filler material begins to liquefy. The "liquidous" temperature is when the filler is completely liquid. CTCG employs the use of silver in copper tube brazing.

 

If substantial "joint strength" is needed, capillary fittings can be used to add more material and consequently reduce weakness in the tube. Brazing is more often than not needed in refrigeration applications.

 

Pressure-Temperature Ratings of Soldered and Brazed Joints

Joining Material	Service Temperature (F)	Fitting Type	Maximum Working Gage Pressure (PSI), for Standard Water Tube Sizes
			1/8 - 1	11/4 - 2	21/2 - 4	5 - 8	10 - 12
Ally Sn50 50-50 Tin-Lead Solder	100	Pressure	200	175	150	135	100
		DWV	—	95	80	70	—
	150	Pressure	150	125	100	90	70
		DWV	—	70	55	45	—
	200	Pressure	100	90	75	70	50
		DWV	—	50	40	35	—
	250	Pressure	85	75	50	45	40
		DWV	—	—	—	—	—
	Saturated Steam	Pressure	15	15	15	15	15
Alloy Sb5 95-5 Tin-Antimony Solder	100	DWV	1090	850	705	660	500
		Pressure	—	390	325	330	—
	150	DWV	625	485	405	375	285
		Pressure	—	225	185	190	—
	200	DWV	505	395	325	305	230
		Pressure	—	180	150	155	—
	250	DWV	270	210	175	165	125
		Pressure	—	95	80	80	—
	Saturated Steam	DWV	15	15	15	15	15
Alloy E	100	Pressure	710	555	460	430	325
		DWV	—	255	210	215	—
	150	Pressure	475	370	305	285	215
		DWV	—	170	140	140	—
	200	Pressure	375	290	240	225	170
		DWV	—	135	110	115	—
	250	Pressure	320	250	205	195	145
		DWV	—	115	95	95	—
	Saturated Steam	Pressure	15	15	15	15	15
Alloy HB	100	DWV	1035	805	670	625	475
		Pressure	—	370	310	315	—
	150	DWV	710	555	460	430	325
		Pressure	—	255	210	215	—
	200	DWV	440	345	285	265	200
		Pressure	—	155	130	135	—
	250	DWV	430	335	275	260	195
		Pressure	—	155	125	130	—
	Saturated Steam	DWV	15	15	15	15	15

*All tables on this page provided from the copper tube handbook, available from the Copper Development Association.

 

 

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