It looks like something one of my former junior techs would have done. His idea of brazing was to dab the silfos on there a touch at a time until he had all the gaps touched over, he used about a full stick every fitting.
He was assigned to help me run some linesets, 2 liquid and 2 suction, for a new Liebert, 2 circuit, install at a military hospital. Once I got the tubing fitted up and the nitro flowing, we both started brazing. I got all but one set of four joints done in the time he took to do the only set of four he did.
I tried to teach him how but, once away from my training he'd go back to dabbing. He works for a major grocery store chain now.
Two things are infinite: the universe and human stupidity; and Im not sure about the universe. Albert Einstein
I had a whole line set that looked like that. Another company called me out, No a/c and they just installed 2 days ago. Guess what it had no refrigerant in it. I ripped out the whole line set and started over. I found out the guy who installed it was using flux with Silfos, he also used 2 tubes of Silfos in a 18ft line set. That company went out of business.