When the wiper has mastered the branch joint placed at an angle of 45°;, he can proceed to wipe the joint placed in the next position, which is flat.

Preparation

The preparation of this joint is identical with the preceding one placed at an angle of 45°. If a new joint is to be prepared, it would be well to pay strict attention to the details, such as keeping the paste on the paper only and having the edge of the paper cut perfectly smooth and even. Before putting on the paper see that the pipe is free from all grease and dirt. The paste and paper will stick better if all the dirt is removed. The branch should be well fitted into the run of the pipe so that no solder will get into the bore of the pipe. The branch should not extend into the run of pipe enough to obstruct the bore of it. If the instructions for preparing the pipe are not carried out as detailed, the wiper will experience some trouble that he may find hard to overcome.

Supporting

The run can be supported on bricks. The branch can be supported on a brick placed at its end the same height as the run. This will bring the joint in the correct flat position. The branch should point away from the wiper. Solder straps can now be poured over the ends of each pipe. If weights are used to hold the pipe firm instead of solder straps, they should be so placed that they will not interfere with the hands when wiping.

Wiping

The wiping of this joint is more difficult as the beginner will experience trouble in heating the bottom and keeping the solder on the bottom. Solder is dropped on the joint and along the pipe so as to bring the pipe to the proper wiping heat. Some solder will accumulate on top of the joint. This is melted off on the catch cloth and this hot solder held against the bottom of the joint. This operation is repeated until the bottom as well as the top of the joint is heated properly. When the solder can be worked freely around the pipe, the branch cloth is taken and each side is wiped from the bottom toward the top. Solder is accumulated on the top where it is wiped off on the catch cloth and put on the bottom of the joint. Now reach way around each side and wipe the edge and body of the joint, a wipe across the top completing the joint. The bottom can be wiped with a cross wipe also if desired. The top and the bottom should be identical. Notice carefully the drawing of this joint and endeavor to have the same lines. The perfecting of these joints comes only with patient practice. The beginner must not get discouraged because of a burn or two. As soon as confidence in oneself has been gained, the possibility of burning the fingers is entirely eliminated.