Method for detecting whether dissimilar metals are being welded

A method for detecting whether two dissimilar metals are being welded together comprising the steps of:

• a. placing in juxtaposition the edges of two metals that are to welded together;
• b. contacting said metals at points heat conductively remote from where they are to be welded with electrical leads which are electrically connected to a voltage or current sensing device;
• c. joining said metals by welding;
• and
• d. detecting whether an electrical signal is present, to reveal the similarity or dissimilarity of said metals.

A method for welding substantially identical metals together comprising the steps of:

• a. placing in juxtaposition the edges of two metals that are to be welded together;
• b. joining said metals by welding;
• c. contacting said metals with electrical leads which are electrically connected to a voltage or current sensing device at points heat conductively remote from the weld, while said weld is hot;
• d. detecting whether an electrical signal is present, to reveal the similarity or dissimilarity of said metals;
• and
• e. dressing the weld if no signal, or a negligible signal is present.

A method for welding substantially identical metals together comprising the steps of:

• a. placing in juxtaposition the edges of two metals that are to be welded together;
• b. contacting said metals at points heat conductively remote from where they are to be welded with electrical leads which are electrically connected to a voltage or current sensing device;
• c. joining said metals by welding;
• d. detecting whether an electrical signal is present to reveal the similarity or dissimilarity of said metals;
• and
• e. dressing the weld if no signal, or a negligible signal is present.