Abstract:
A weld tab has a tab which contains a circular groove therein. A metal stick is received in the circular groove. The tab has an end which has a snapping groove to receive a pad. The pad has two ends each received in the snapping groove of the tab.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Not Applicable 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a weld tab, and more particularly, to a weld tab containing a circular groove which has a slit. 
     2. Description of the Related Art 
     A conventional weld tab in accordance with the prior art shown in FIG. 7 comprises two tabs (83) and a clamping member (80) to clamp the tabs (83). The clamping member (80) has two magnetic devices (81) and two resilient flats (82) attached thereto. When the two parts (84; 85) are welded, a man must attach a horizontal stabilizer (not shown) behind a welding groove (841) by adhesive tape and puts the magnetic devices (81) of the clamping member (80) on the sides of the part (84). Then the tabs (83) are clamped by two resilient flats (82) and forms a closed weld (841) to prevent the welding material from running out from the two sides of the welding groove (841). 
     Although the clamping member (80) can clamp the tabs (83) against the two sides of the welding groove (841), in fact the resilient flat (82) of the clamping member (80) easily becomes fatigued and loses the elastic resilience when being used for a long time. Furthermore the welding of most large parts usually need to be repeated several times in order to make sure that the parts are securely welded. The tabs (83) are made of ceramic which can not be welded to iron. So the tabs (83) only have a side pressure from the resilient flat (82) of the clamping member (80) during welding. There is no stabilization or support device between the tabs (83) and the parts (84); (85) to prevent them from detaching except clamping member (80). So the tabs are not very convenient in use. 
     When using the weld tab, the welder normally attaches the tabs (83) to the side of the part (84) by a adhesive tape. Since the adhesive tape very easily detaches from the tabs (83) and the parts (84, 83) when it is at a high temperature, a welder must reattach the tape several times before finished. It is a big trouble in the manufacturing. 
     The present invention has arisen to mitigate and obviate the disadvantage of the conventional weld tabs. 
     BRIEF SUMMARY OF THE INVENTION 
     In accordance with one aspect of the present invention, a weld tab includes a tab having an inclined circular groove on side and a metal rod received in the groove. When the first welding pass is made, the weld metal is closed at the bottom of the welding groove and welds the metal rod. Then the metal rod provides a stabilization function to the tab which closes the weld when welding from one end to the other. So the prevent invention of the weld tab not only makes welding easier but also promotes the quality of welding. 
    
    
     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     FIG. 1 is an exploded view of a weld tab in accordance with the present invention; 
     FIG. 2 is an operational perspective view of the weld tab in FIG. 1; 
     FIG. 3 is an operational cross-sectional side plan view of the weld tab in FIG. 2; 
     FIG. 4 is an operational cross-sectional side plan view of the weld tab in FIG. 3 when the welding is finished; 
     FIG. 5 is a perspective view of a second embodiment of the weld tab in accordance with the present invention; 
     FIG. 6 is an operational side plan view of a third embodiment of the weld tab in accordance with the present invention used to join two flat plates in a single plane; and 
     FIG. 7 is an operational perspective view of a conventional weld tab in accordance with the prior art. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to the drawings and initially to FIGS. 1 and 2, a weld tab in accordance with the present invention comprises a tab (10) each containing a circular groove (11) and a clamping recess (13). The circular groove (11) contains a slit (11) and has a metal rod (12) received therein. The circular groove (11) is defined to align with a weld groove (301) when the tab (10) is positioned against the parts (30, 40) to be welded. The weld tab further includes a horizontal stabilizer groove (20) received in the clamping recess (13) of the tab (10). 
     The horizontal stabilizer (20) abuts the bottom of the weld groove (301) of the parts (30, 40), and is held in position by adhesive tape (21). Referring to FIG. 3, the clamping recess (13) of the tab (10) receives one end of the horizontal stabilizer (20) to align the circular groove (11) at the end of the weld groove (301). The tab (10) is attached to the part (30) to be welded by two-sided adhesive (22) to hold the tab (10) in place when starting to weld. 
     When starting to weld the metal rod (12) received in the circular groove (11) is bonded with the welding filler (50) in the weld groove (301) to firmly hold against the tab (10) against the sides of the parts (30, 40) being welded and the end of the weld groove (301). Then, even if the adhesive tape (21) detaches from the horizontal stabilizer (20) or the metal rod (12) in the tab (10) bonded to the welding filler (50) at the bottom of the welding groove (301) will firmly hold the tabs 10) and horizontal stabilizer (20) in place. 
     Referring to FIG. 4, the tab (10) still securely closes the two ends of the weld groove (301) to prevent the welding filler (50) from leaking until the weld is finished. The tab (10) is released from the parts (30, 40) when the metal rod (12) is entirely melted and flows into the weld groove (301), or when the slit (111) of the circular groove (11) is gradually broken along the complete length of the metal rod (12) due to the high temperature of repeated welding. 
     The metal rod (12) is the same material as of the welding filler (50), so they are melted and combined by the high temperature of the welding process. The length of the metal rod (12) in the circular groove (11) is shorter than the thickness of the part (30). The length of the metal rod (12) is determined based on the thickness of the parts (30) in order to be melted and combined with the welding filler (50) in the weld in the welding process, consequently, the weld tab does not influence the shape of the weld and has a good consistency. 
     Referring to FIG. 5, it is a second embodiment of the present invention. The tab (60) has two sides each having a circular groove (61, 63) and receiving a metal rod (62, 64). Then user can effectively use the tab (60) twice by using it on the other end during the second use. 
     Referring to FIG. 6, it is an another type of the present invention which is used to weld two parallel parts (75, 76) in a flat plane. The tab (70) has a side containing a circular groove (71) receiving a metal rod (72) therein and use the weldable metal rod (72) to hold the tab (70) in place. The horizontal stabilizer (73) is attached to the bottom of the two parts (75, 76) by adhesive tape (74) to make the welding process easier. 
     Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modification and variation can be made without departing from the spirit and scope of the invention as hereinafter claimed.