View Single Post
Old 04-14-2020, 09:44 PM
Camaro Zach's Avatar
Camaro Zach Camaro Zach is offline
Senior Member
Join Date: Jan 2006
Location: Alvin Texas
Posts: 765
Default Cracking aluminum

Bending up some 6061 1 1/4” aluminum sch 40 pipe and I start having problems with cracking all of the sudden. 700 linear foot over the last few months and a couple different lot#’s of pipe. Not a problem until Saturday morning when a joint cracks about 40 degrees into a 45 degree bend. Try again on the same piece and bam! 30 degrees in and another crack... try a new piece and it cracks within 20 degrees, rinse repeat and I have 4 20’ sticks left. As I go out to the trailer to compare lot #s on the remaining pieces I notice one pipe is split down the middle almost its entire length. Has anyone seen this before?

I tried annealing the pipe that was cracking and have had mixed results. One bent a full 180 and the other bent about 160 degrees before breaking.

NOTE: the piece split down the middle has not been bent or modified at all. It is in the condition that it was delivered in.
Attached Thumbnails
Click image for larger version

Name:	0CCBE580-4BE3-4E1A-9D02-C799B04DF443.jpg
Views:	195
Size:	195.4 KB
ID:	155595   Click image for larger version

Name:	2830FF77-3DB2-4EC2-AF91-97985FAE2588.jpg
Views:	186
Size:	194.7 KB
ID:	155596   Click image for larger version

Name:	E69F13CA-A79D-4AB7-8245-6B24C4F4CF8A.jpg
Views:	190
Size:	189.1 KB
ID:	155597   Click image for larger version

Name:	B58DFFC5-0DF2-41BD-80A4-3A96DE690E99.jpg
Views:	199
Size:	193.6 KB
ID:	155598   Click image for larger version

Name:	27F45710-B529-4233-B5B8-90813EA6E3A7.jpg
Views:	196
Size:	203.6 KB
ID:	155599  

Reply With Quote