Search found 5 matches

by weldprof
Sun Mar 25, 2012 6:26 pm
Forum: Stick Welding/Arc Welding - Shielded Metal Arc Welding
Topic: DC polarity
Replies: 22
Views: 24731

Re: DC polarity

The AWS tried, for the most part, years ago to eliminate the terminology "Reverse" and "Straight" Polarity. Welders (operators) have not let go of the terminology. There is much correct information on the responses to the question. The important fact that I either missed or was n...
by weldprof
Sun Mar 25, 2012 5:58 pm
Forum: Welding Forum General Shop Talk
Topic: cast iron welding
Replies: 17
Views: 1867

Re: cast iron welding

Excellent machine. Set it up as you were doing steel. Tungsten same, polarity same, so forth and so on. Once you have determined the length of the cracks and their severity then drill holes at the end of the cracks to stop the propagation of the cracks. If the holes are not beginning from an edge th...
by weldprof
Sun Mar 25, 2012 2:43 pm
Forum: Welding Forum General Shop Talk
Topic: Urgent advice needed
Replies: 2
Views: 793

Re: Urgent advice needed

Berend, can you submit a drawing of the (simple sketch) with items listed as in your post? I would suggest back-step welding technique with the addition of alternating welds from one end and opposite sides of attachments to reduce or eliminate distortion. I may also suggest a temporary internal supp...
by weldprof
Sun Mar 25, 2012 2:32 pm
Forum: Welding Forum General Shop Talk
Topic: cast iron welding
Replies: 17
Views: 1867

Re: cast iron welding

The first thing we need to know is what is your welding experience and process ability? It could be Oxy-fuel brazed or GTAW with silicon bronze rod. First the crack should be dye penetration tested to see where the crack ends and starts. Sometimes the human eye cannot see the extent of the cracking....
by weldprof
Sun Mar 25, 2012 2:15 pm
Forum: Welding Projects - Welding project Ideas - Welding project plans
Topic: Welding alloy steels
Replies: 7
Views: 2449

Re: Welding alloy steels

Drill the holes completely through. Cut the pin length less 1/16 inch. Place the pins in the holes and weld from the back side filling the space left by the recess with the GTAW process. Weld at low amperage and you should not have a problem with your heat treatment. Do not allow too much weld conve...