Não faça isso.
As microondas, embora seguras, emitem uma radiação significativa que é controlada, em parte, por um sistema de intertravamento de portas cuidadosamente projetado. Se estiver comprometida, existe risco de vazamento de radiação.
Você não conserta as portas de microondas, envia de volta para elas consertar ou substitui a unidade inteira.
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A Organização Mundial da Saúde (OMS) tem o que dizer sobre o forno de microondas segurança.
Microwave safety: The design of microwave ovens ensures that the microwaves are contained within the oven and can only be present when the oven is switched on and the door is shut. Leakage around and through the glass door is limited by design to a level well below that recommended by international standards. However, microwave leakage could still occur around damaged, dirty or modified microwave ovens. It is therefore important that the oven is maintained in good condition. Users should check that the door closes properly and that the safety interlock devices, fitted to the door to prevent microwaves from being generated while it is open, work correctly. The door seals should be kept clean and there should be no visible signs of damage to the seals or the outer casing of the oven. If any faults are found or parts of the oven are damaged, it should not be used until it has been repaired by an appropriately qualified service engineer [emphasis added].
A Administração de Alimentos e Medicamentos dos EUA (FDA) diz que
Checking For Leakage: There is little cause for concern about excess microwaves leaking from ovens unless the door hinges, latch, or seals are damaged. If you suspect a problem, contact the oven manufacturer, a microwave oven service organization, your state health department, or the closest FDA office [emphasis added].
O problema descrito não é apenas apertar um parafuso ou colocar um selo de volta em sua pista. A porta está desalinhada e representa um risco. Tentar realinhar e soldar partes do sistema de segurança parece muito desaconselhável.